chore: import upstream snapshot with attribution

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,37 @@
+---
+name: Bug report
+about: Report an issue to help the project improve.
+title: ''
+labels: bug
+type: 'Bug'
+assignees: ''
+
+---
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Screenshots
+
+If applicable, add screenshots or video to help explain your problem.
+
+## Platform
+
+- Device: [e.g. Desktop, Mobile]
+- OS: [e.g. macOS]
+- Browser and version: [e.g. Chrome, Safari]
+- Version: [e.g. v1.2.0]

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,22 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+blank_issues_enabled: true
+contact_links:
+  - name: Questions & Discussions
+    url: https://meta.answer.dev
+    about: If you have any questions while using.

.github/ISSUE_TEMPLATE/enhancement_request.md

@@ -0,0 +1,21 @@
+---
+name: Enhancement request
+about: Suggest an enhancement for this project. Improve an existing feature.
+title: ''
+labels: enhancement
+type: 'Feature'
+assignees: ''
+
+---
+
+## Is your enhancement request related to a problem? Please describe
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature request
+about: Suggest an idea or possible new feature for this project.
+title: ''
+labels: new-feature
+type: 'Feature'
+assignees: ''
+
+---
+
+## Is your feature request related to a problem? Please describe
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,7 @@
+Fixes #
+
+## Proposed Changes
+
+  -
+  -
+  -

.github/workflows/build-binary-for-release.yml

@@ -0,0 +1,60 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Build Binary For Release
+
+on:
+  push:
+    tags:
+      - "v*"
+permissions:
+  contents: write
+
+jobs:
+  build-goreleaser:
+    if: ${{ github.repository_owner == 'apache' }}
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up Node
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.18.1
+
+    - name: Node Build
+      run: make install-ui-packages ui
+
+    - name: Setup Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.23
+
+    - name: Install GoReleaser
+      run: go install github.com/goreleaser/goreleaser/v2@latest
+
+    - name: Run GoReleaser
+      run: |
+        "$(go env GOPATH)/bin/goreleaser" release --clean --skip=validate
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - uses: actions/upload-artifact@v4
+      with:
+        name: answer
+        path: ./dist/*

.github/workflows/build-image-for-latest-release.yml

@@ -0,0 +1,63 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Build Latest Docker Image For Release
+
+on:
+  push:
+    tags:
+      - v2.*
+      - v1.*
+      - v0.*
+      - "!v*-RC*"
+  # pull_request:
+  #   branches: [ "main" ]
+
+jobs:
+  build:
+    if: ${{ github.repository_owner == 'apache' }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up QEMU
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y qemu-user-static
+
+    - name: Set up Docker Buildx
+      run: |
+        docker buildx create --name answer-builder --driver docker-container --use
+        docker buildx inspect --bootstrap
+
+    - name: Login to DockerHub
+      run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login --username "${{ secrets.DOCKERHUB_USER }}" --password-stdin
+
+    - name: Build and push
+      run: |
+        BUILD_DATE="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+        docker buildx build \
+          --file ./Dockerfile \
+          --platform linux/amd64,linux/arm64 \
+          --push \
+          --tag apache/answer:latest \
+          --label org.opencontainers.image.created="${BUILD_DATE}" \
+          --label org.opencontainers.image.revision="${GITHUB_SHA}" \
+          --label org.opencontainers.image.source="https://github.com/${GITHUB_REPOSITORY}" \
+          --label org.opencontainers.image.version="${GITHUB_REF_NAME#v}" \
+          .

.github/workflows/build-image-for-manual.yml

@@ -0,0 +1,61 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Manual Build Docker Image For Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag_name:
+        type: string
+        required: true
+        description: 'DockerHub img tag name'
+
+jobs:
+  build:
+    if: ${{ github.repository_owner == 'apache' }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up QEMU
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y qemu-user-static
+
+    - name: Set up Docker Buildx
+      run: |
+        docker buildx create --name answer-builder --driver docker-container --use
+        docker buildx inspect --bootstrap
+
+    - name: Login to DockerHub
+      run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login --username "${{ secrets.DOCKERHUB_USER }}" --password-stdin
+
+    - name: Build and push
+      run: |
+        BUILD_DATE="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+        docker buildx build \
+          --file ./Dockerfile \
+          --platform linux/amd64,linux/arm64 \
+          --push \
+          --tag "apache/answer:${{ inputs.tag_name }}" \
+          --label org.opencontainers.image.created="${BUILD_DATE}" \
+          --label org.opencontainers.image.revision="${GITHUB_SHA}" \
+          --label org.opencontainers.image.source="https://github.com/${GITHUB_REPOSITORY}" \
+          --label org.opencontainers.image.version="${{ inputs.tag_name }}" \
+          .

.github/workflows/build-image-for-release.yml

@@ -0,0 +1,64 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Build Docker Image For Release
+
+on:
+  push:
+    tags:
+      - v2.*
+      - v1.*
+      - v0.*
+  # pull_request:
+  #   branches: [ "main" ]
+
+jobs:
+  build:
+    if: ${{ github.repository_owner == 'apache' }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up QEMU
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y qemu-user-static
+
+    - name: Set up Docker Buildx
+      run: |
+        docker buildx create --name answer-builder --driver docker-container --use
+        docker buildx inspect --bootstrap
+
+    - name: Login to DockerHub
+      run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login --username "${{ secrets.DOCKERHUB_USER }}" --password-stdin
+
+    - name: Build and push
+      env:
+        IMAGE_TAG: ${{ github.ref_name }}
+      run: |
+        BUILD_DATE="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+        docker buildx build \
+          --file ./Dockerfile \
+          --platform linux/amd64,linux/arm64 \
+          --push \
+          --tag "apache/answer:${IMAGE_TAG#v}" \
+          --label org.opencontainers.image.created="${BUILD_DATE}" \
+          --label org.opencontainers.image.revision="${GITHUB_SHA}" \
+          --label org.opencontainers.image.source="https://github.com/${GITHUB_REPOSITORY}" \
+          --label org.opencontainers.image.version="${IMAGE_TAG#v}" \
+          .

.github/workflows/build-image-for-test.yml

@@ -0,0 +1,52 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Build Docker Image For Test
+
+on:
+  push:
+    branches: [ "test" ]
+
+jobs:
+  build:
+    if: ${{ github.repository_owner == 'apache' }}
+    name: Build and Push
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Login to DockerHub
+      run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login --username "${{ secrets.DOCKERHUB_USER }}" --password-stdin
+
+    - name: Set up Docker Buildx
+      run: |
+        docker buildx create --name answer-builder --driver docker-container --use
+        docker buildx inspect --bootstrap
+
+    - name: Build and push
+      run: |
+        BUILD_DATE="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+        docker buildx build \
+          --file ./Dockerfile \
+          --platform linux/amd64 \
+          --push \
+          --tag apache/answer:test \
+          --label org.opencontainers.image.created="${BUILD_DATE}" \
+          --label org.opencontainers.image.revision="${GITHUB_SHA}" \
+          --label org.opencontainers.image.source="https://github.com/${GITHUB_REPOSITORY}" \
+          .

.github/workflows/check-asf-header.yml

@@ -0,0 +1,46 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: CI
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+
+# Concurrency strategy:
+#   github.workflow: distinguish this workflow from others
+#   github.event_name: distinguish `push` event from `pull_request` event
+#   github.event.number: set to the number of the pull request if `pull_request` event
+#   github.run_id: otherwise, it's a `push` or `schedule` event, only cancel if we rerun the workflow
+#
+# Reference:
+#   https://docs.github.com/en/actions/using-jobs/using-concurrency
+#   https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    name: Check and lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check license header
+        uses: korandoru/hawkeye@v3

.github/workflows/lint.yml

@@ -0,0 +1,62 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+name: Lint
+
+on:
+  push:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
+          cache: true
+
+      - name: Run go mod tidy
+        run: go mod tidy
+
+      - name: Run golangci-lint
+        run: make lint
+
+      - name: Check for uncommitted changes
+        shell: bash
+        run: |
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "::error::Uncommitted changes detected"
+            git status
+            git diff
+            exit 1
+          fi