ci: add release automation

.github/workflows/release-finalize.yml

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+name: Release Finalize
+
+on:
+  workflow_run:
+    workflows:
+      - "Release Build - Java"
+      - "Release Build - NodeJS"
+      - "Release Build - Python"
+    types: [completed]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  finalize:
+    if: >-
+      github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Extract tag and language
+        id: parse
+        run: |
+          TAG="${{ github.event.workflow_run.head_branch }}"
+          LANGUAGE="${TAG%%-v*}"
+          VERSION="${TAG#"${LANGUAGE}"-v}"
+          RELEASE_BRANCH="release-${TAG}"
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+          echo "language=${LANGUAGE}" >> "$GITHUB_OUTPUT"
+          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
+          echo "release_branch=${RELEASE_BRANCH}" \
+            >> "$GITHUB_OUTPUT"
+
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          ref: main
+          fetch-depth: 0
+
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email \
+            "github-actions[bot]@users.noreply.github.com"
+
+      - name: Create release branch
+        run: |
+          git checkout -b \
+            "${{ steps.parse.outputs.release_branch }}"
+
+      - name: Update README with ARN tables
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAG: ${{ steps.parse.outputs.tag }}
+          LANGUAGE: ${{ steps.parse.outputs.language }}
+          VERSION: ${{ steps.parse.outputs.version }}
+        run: ./ci/release-finalize.sh
+
+      - uses: actions/setup-node@v4
+
+      - name: Format markdown tables
+        env:
+          LANGUAGE: ${{ steps.parse.outputs.language }}
+        run: |
+          npm install --no-save markdown-table-formatter
+          ./node_modules/.bin/markdown-table-formatter \
+            "${LANGUAGE}/README.md"
+
+      - name: Commit changes
+        env:
+          TAG: ${{ steps.parse.outputs.tag }}
+          LANGUAGE: ${{ steps.parse.outputs.language }}
+        run: |
+          git add "${LANGUAGE}/README.md"
+          git commit -m \
+            "docs: update ${LANGUAGE} layer ARNs for ${TAG}"
+
+      - name: Push release branch
+        env:
+          REMOTE: >-
+            https://x-access-token:${{ secrets.RELEASE_PAT
+            }}@github.com/${{ github.repository }}
+        run: |
+          git remote set-url origin "${REMOTE}"
+          git push origin \
+            "${{ steps.parse.outputs.release_branch }}"
+
+      - name: Create pull request
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
+          TAG: ${{ steps.parse.outputs.tag }}
+          LANGUAGE: ${{ steps.parse.outputs.language }}
+          RELEASE_BRANCH: >-
+            ${{ steps.parse.outputs.release_branch }}
+        run: |
+          REPO="${GITHUB_REPOSITORY}"
+          BODY="Updates \`${LANGUAGE}/README.md\` with layer ARNs "
+          BODY+="from the [pre-release]"
+          BODY+="(https://github.com/${REPO}/releases/tag/${TAG})."
+          BODY+=$'\n\n'
+          BODY+="Merging promotes the pre-release to a full release."
+          gh pr create \
+            --title "docs: release ${TAG}" \
+            --body "${BODY}" \
+            --base main \
+            --head "${RELEASE_BRANCH}"

.github/workflows/release-prepare.yml

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+name: Release Prepare
+
+on:
+  workflow_dispatch:
+    inputs:
+      language:
+        description: "Language to release"
+        required: true
+        type: choice
+        options:
+          - java
+          - nodejs
+          - python
+      version:
+        description: "Version (e.g. 1.41.0)"
+        required: true
+        type: string
+      otel_lambda_tag:
+        description: >-
+          opentelemetry-lambda release tag to pin the submodule to
+          (e.g. layer-python/0.19.0, layer-nodejs/0.21.0,
+          layer-javaagent/0.19.0)
+        required: true
+        type: string
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  prepare:
+    runs-on: ubuntu-22.04
+    env:
+      LANGUAGE: ${{ inputs.language }}
+      VERSION: ${{ inputs.version }}
+      BRANCH: prepare-${{ inputs.language }}-v${{ inputs.version }}
+    steps:
+      - name: Validate version format
+        run: |
+          if ! [[ "${{ inputs.version }}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "::error::Version must be semver without v prefix (e.g. 1.41.0)"
+            exit 1
+          fi
+
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+          submodules: true
+
+      - name: Check release tag does not already exist
+        run: |
+          TAG="${LANGUAGE}-v${VERSION}"
+          if git tag --list "${TAG}" | grep -q .; then
+            echo "::error::Tag ${TAG} already exists"
+            exit 1
+          fi
+
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email \
+            "github-actions[bot]@users.noreply.github.com"
+
+      - name: Create branch
+        run: git checkout -b "${BRANCH}"
+
+      - name: Update submodule to otel-lambda release
+        run: |
+          cd opentelemetry-lambda
+          git fetch --tags origin
+          git checkout "${{ inputs.otel_lambda_tag }}"
+          cd ..
+
+      - name: Run prepare script
+        run: ./ci/release-prepare.sh
+
+      - name: Commit changes
+        run: |
+          git add \
+            CHANGELOG.md \
+            README.md \
+            "${LANGUAGE}/layer-data.sh" \
+            "${LANGUAGE}/sample-apps/template.yaml" \
+            opentelemetry-lambda
+          COMMIT_MSG="feat: prepare release ${LANGUAGE} v${VERSION}"
+          git commit -m "${COMMIT_MSG}"
+
+      - name: Push branch
+        env:
+          REMOTE: >-
+            https://x-access-token:${{ secrets.RELEASE_PAT
+            }}@github.com/${{ github.repository }}
+        run: |
+          git remote set-url origin "${REMOTE}"
+          git push origin "${BRANCH}"
+
+      - name: Ensure release label exists
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
+        run: |
+          gh label create release \
+            --color "0075ca" \
+            --description "Release PR" \
+            2>/dev/null || true
+
+      - name: Create pull request
+        env:
+          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
+        run: |
+          gh pr create \
+            --title "feat: prepare release ${LANGUAGE} v${VERSION}" \
+            --body "Automated release preparation for \`${LANGUAGE}-v${VERSION}\`.
+
+          opentelemetry-lambda submodule pinned to: \`${{ inputs.otel_lambda_tag }}\`
+
+          ### Pre-merge checklist
+
+          - [ ] Review CHANGELOG.md entry
+          - [ ] Verify \`${LANGUAGE}/layer-data.sh\` version
+          - [ ] Verify \`${LANGUAGE}/sample-apps/template.yaml\` version
+          - [ ] Verify README.md component versions
+          - [ ] Approve this PR
+
+          Merging will create tag \`${LANGUAGE}-v${VERSION}\` and trigger the release build." \
+            --base main \
+            --head "${BRANCH}" \
+            --label release

.github/workflows/release-publish.yml

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+name: Release Publish
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [main]
+
+permissions:
+  contents: write
+
+jobs:
+  publish:
+    if: >-
+      github.event.pull_request.merged == true &&
+      (startsWith(
+        github.event.pull_request.head.ref,
+        'release-java-v') ||
+      startsWith(
+        github.event.pull_request.head.ref,
+        'release-nodejs-v') ||
+      startsWith(
+        github.event.pull_request.head.ref,
+        'release-python-v'))
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Extract tag from branch name
+        id: parse
+        run: |
+          BRANCH="${{ github.event.pull_request.head.ref }}"
+          TAG="${BRANCH#release-}"
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+
+      - name: Promote pre-release to full release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAG: ${{ steps.parse.outputs.tag }}
+        run: |
+          gh release edit "${TAG}" \
+            --repo "${{ github.repository }}" \
+            --prerelease=false \
+            --latest

.github/workflows/release-tag.yml

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+name: Release Tag
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [main]
+
+permissions:
+  contents: write
+
+jobs:
+  create-tag:
+    if: >-
+      github.event.pull_request.merged == true &&
+      (startsWith(
+        github.event.pull_request.head.ref,
+        'prepare-java-v') ||
+      startsWith(
+        github.event.pull_request.head.ref,
+        'prepare-nodejs-v') ||
+      startsWith(
+        github.event.pull_request.head.ref,
+        'prepare-python-v'))
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Extract tag from branch name
+        id: parse
+        run: |
+          BRANCH="${{ github.event.pull_request.head.ref }}"
+          TAG="${BRANCH#prepare-}"
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          ref: main
+          fetch-depth: 0
+
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email \
+            "github-actions[bot]@users.noreply.github.com"
+
+      - name: Create and push tag
+        env:
+          TAG: ${{ steps.parse.outputs.tag }}
+          REMOTE: >-
+            https://x-access-token:${{ secrets.RELEASE_PAT
+            }}@github.com/${{ github.repository }}
+        run: |
+          git tag -m "${TAG}" "${TAG}"
+          git remote set-url origin "${REMOTE}"
+          git push origin "${TAG}"