chore: import upstream snapshot with attribution

.devcontainer/dev/Dockerfile

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+#  Copyright 2021 Collate
+#  Licensed 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.
+
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-22.04
+
+# System libraries required for building OpenMetadata connectors
+# Mirrors: .github/actions/prepare-for-docker-build/action.yml
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get install -y --no-install-recommends \
+        unixodbc-dev \
+        librdkafka-dev \
+        gcc \
+        libsasl2-dev \
+        build-essential \
+        libssl-dev \
+        libffi-dev \
+        libevent-dev \
+        wkhtmltopdf \
+        libkrb5-dev \
+        jq \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*

.devcontainer/dev/devcontainer.json

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+{
+  "name": "OpenMetadata - Development",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "../.."
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/java:1": {
+      "version": "21",
+      "installMaven": true,
+      "mavenVersion": "3.9.9"
+    },
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.11"
+    },
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "22.17.0"
+    }
+  },
+  "postCreateCommand": "npm install -g yarn@1.22.22 --force && bash .devcontainer/dev/post-create.sh",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "vscjava.vscode-java-pack",
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode",
+        "eamodio.gitlens",
+        "redhat.vscode-yaml"
+      ],
+      "settings": {
+        "editor.formatOnSave": true
+      }
+    }
+  },
+  "remoteEnv": {
+    "PATH": "${containerEnv:PATH}:${containerEnv:HOME}/.local/bin"
+  },
+  "remoteUser": "vscode",
+  "forwardPorts": [3000],
+  "portsAttributes": {
+    "3000": { "label": "Frontend Dev Server" }
+  }
+}

.devcontainer/dev/post-create.sh

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+#!/usr/bin/env bash
+#  Copyright 2021 Collate
+#  Licensed 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.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+echo "=== Setting up OpenMetadata Development Environment ==="
+
+cd "$REPO_ROOT"
+
+# Ensure ANTLR4 is available
+echo "Setting up ANTLR4..."
+# Ensure user-local binaries are available for this script and child processes.
+export PATH="$HOME/.local/bin:$PATH"
+
+ANTLR_VERSION=4.9.2
+ANTLR_JAR_DIR="$HOME/.local/lib"
+ANTLR_JAR_PATH="$ANTLR_JAR_DIR/antlr-${ANTLR_VERSION}-complete.jar"
+ANTLR_BIN_PATH="$HOME/.local/bin/antlr4"
+
+CURRENT_ANTLR_VERSION=""
+if command -v antlr4 &> /dev/null; then
+  CURRENT_ANTLR_VERSION="$(antlr4 -version 2>&1 | awk '{print $NF}')"
+fi
+
+if [ "$CURRENT_ANTLR_VERSION" != "$ANTLR_VERSION" ]; then
+  if ! command -v java &> /dev/null; then
+    echo "ERROR: Java runtime is required to run ANTLR."
+    exit 1
+  fi
+
+  mkdir -p "$HOME/.local/bin" "$ANTLR_JAR_DIR"
+  curl -fsSL "https://www.antlr.org/download/antlr-${ANTLR_VERSION}-complete.jar" -o "$ANTLR_JAR_PATH"
+
+  cat > "$ANTLR_BIN_PATH" <<'EOF'
+#!/usr/bin/env bash
+set -e
+exec java -jar "$HOME/.local/lib/antlr-4.9.2-complete.jar" "$@"
+EOF
+
+  chmod 755 "$ANTLR_BIN_PATH"
+fi
+
+# Install frontend dependencies
+echo "Installing frontend dependencies..."
+cd openmetadata-ui/src/main/resources/ui
+yarn install --frozen-lockfile
+cd -
+
+# Set up Python virtual environment for ingestion
+echo "Setting up Python ingestion environment..."
+if command -v python3 &> /dev/null; then
+  PYTHON_BIN="$(command -v python3)"
+elif command -v python &> /dev/null; then
+  PYTHON_BIN="$(command -v python)"
+else
+  echo "ERROR: Python is required but was not found in PATH."
+  exit 1
+fi
+
+echo "Running python version: $($PYTHON_BIN --version)"
+
+# Always use a dedicated venv in the devcontainer to avoid overwriting the host .venv
+# (which is volume-mounted and likely contains platform-incompatible binaries).
+VENV_DIR=".venv-devcontainer"
+
+"$PYTHON_BIN" -m venv "$VENV_DIR"
+source "$VENV_DIR/bin/activate"
+python -m pip install --upgrade pip
+
+# Run Make targets from repo root to ensure scripts/ and ingestion/ paths resolve correctly
+make install_dev generate
+
+# Verify prerequisites
+echo "Verifying prerequisites..."
+make prerequisites
+
+echo "=== Development environment ready ==="
+echo ""
+echo "Quick start commands:"
+echo "  Backend:   mvn clean package -DskipTests"
+echo "  Frontend:  cd openmetadata-ui/src/main/resources/ui && yarn start"
+echo "  Ingestion: source $VENV_DIR/bin/activate && cd ingestion"
+echo "  Format:    mvn spotless:apply (Java) | yarn lint:fix (Frontend)"