chore: import upstream snapshot with attribution

.github/test/README.md

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+# GitHub Action Tests
+
+This directory contains necessary files to allow local testing of GitHub Actions workflows, composite actions, etc. You will need to install [act](https://github.com/nektos/act) to perform tests.
+
+## Workflow tests
+
+Trigger specific workflow files by specifying their full path:
+
+```
+act -W .github/workflow/release.yml
+```
+
+You will likely need to override any custom runners we use, e.g. buildjet. For example:
+
+```
+override=catthehacker/ubuntu:act-latest
+
+act -W .github/workflow/release.yml \
+    -P buildjet-8vcpu-ubuntu-2204=$override
+
+# override multiple images at the same time
+act -W .github/workflow/release.yml \
+    -P buildjet-8vcpu-ubuntu-2204=$override \
+    -P buildjet-16vcpu-ubuntu-2204=$override
+```
+
+Trigger with specific event payloads to test pushing to branches or tags:
+
+```
+override=catthehacker/ubuntu:act-latest
+
+# simulate push to main
+act -W .github/workflow/publish.yml \
+    -P buildjet-8vcpu-ubuntu-2204=$override \
+    -P buildjet-16vcpu-ubuntu-2204=$override \
+    -e .github/events/push-tag-main.json
+
+# simulate a `build-` prefixed tag
+act -W .github/workflow/publish.yml \
+    -P buildjet-8vcpu-ubuntu-2204=$override \
+    -P buildjet-16vcpu-ubuntu-2204=$override \
+    -e .github/events/push-tag-buld.json
+```
+
+By default, `act` will send a push event. To trigger a different event:
+
+```
+# basic syntax
+act <EVENT> ...
+
+# simulate a pull request
+act pull_request
+
+# only trigger a specific workflow
+act pull_request -W .github/workflow/pr_checks.yml
+```
+
+## Composite action tests
+
+The composite (custom) action tests can be run by triggering the `test-actions` workflow:
+
+```
+act -W .github/test/test-actions.yml
+```
+
+## Helpful flags
+
+- `--pull=false` - perform fully offline tests if all images are already present
+- `-j <job_name>` - run the specified job only
+- `-l push` - list all workflows with push triggers

.github/test/events/push-main.json

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+{
+  "ref": "refs/heads/main"
+}

.github/test/events/push-tag-build.json

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+{
+  "ref": "refs/tags/build-buildtag"
+}

.github/test/events/push-tag-docker-nonsemver.json

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+{
+  "ref": "refs/tags/v.docker.nonsemver"
+}

.github/test/events/push-tag-docker.json

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+{
+  "ref": "refs/tags/v.docker.1.2.3"
+}

.github/test/events/push-tag-infra-prod.json

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+{
+  "ref": "refs/tags/infra-prod-anything"
+}

.github/test/events/push-tag-infra-test.json

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+{
+  "ref": "refs/tags/infra-test-anything"
+}

.github/test/events/push-tag-semver.json

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+{
+  "ref": "refs/tags/1.2.3"
+}

.github/test/events/push-tag.json

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+{
+  "ref": "refs/tags/standard-tag"
+}

.github/test/test-actions.yml

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+name: Test Actions
+
+on:
+  workflow_dispatch:
+
+jobs:
+  get-image-tag-none:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Log current ref
+        run: |
+          echo "ref: ${{ github.ref }}"
+          echo "ref_type: ${{ github.ref_type }}"
+          echo "ref_name: ${{ github.ref_name }}"
+
+      - name: Run without input tag
+        id: get_tag
+        # this step may fail depending on the current ref
+        continue-on-error: true
+        uses: ./.github/actions/get-image-tag
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-null:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Log current ref
+        run: |
+          echo "ref: ${{ github.ref }}"
+          echo "ref_type: ${{ github.ref_type }}"
+          echo "ref_name: ${{ github.ref_name }}"
+
+      - name: Run without input tag
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        # this step may fail depending on the current ref
+        continue-on-error: true
+        with:
+          # this should behave exactly as when no tag is provided
+          tag: null
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-override:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run with tag override
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        with:
+          tag: "abc-123"
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-invalid-string:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run with invalid string
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        # this step is expected to fail
+        continue-on-error: true
+        with:
+          # does not end with alphanumeric character
+          tag: "abc-123-"
+
+      - name: Fail job if previous step did not fail
+        if: steps.get_tag.outcome != 'failure'
+        run: exit 1
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-prerelease:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run with prerelease semver
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        with:
+          tag: "v1.2.3-beta.4"
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-semver:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run with basic semver
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        with:
+          tag: "v1.2.3"
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"
+
+  get-image-tag-invalid-semver:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run with invalid semver
+        id: get_tag
+        uses: ./.github/actions/get-image-tag
+        # this step is expected to fail
+        continue-on-error: true
+        with:
+          tag: "v1.2.3-"
+
+      - name: Fail job if previous step did not fail
+        if: steps.get_tag.outcome != 'failure'
+        run: exit 1
+
+      - name: Verify output
+        run: |
+          echo "${{ toJson(steps.get_tag) }}"