release-standalone.yml

name: Release Standalone

on:
  workflow_run:
    workflows: [Build and Push Docker Image]
    types: [completed]
    branches: [main]

concurrency:
  group: release-standalone
  cancel-in-progress: false

permissions: {}

jobs:
  check:
    name: Check for new version
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    timeout-minutes: 5
    permissions:
      contents: read
    outputs:
      version: ${{ steps.v.outputs.version }}
      release: ${{ steps.v.outputs.release }}
      sha: ${{ github.event.workflow_run.head_sha }}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          ref: ${{ github.event.workflow_run.head_sha }}

      - id: v
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          WEBAPP=$(node -p "require('./standalone/webapp/package.json').version")
          SERVER=$(node -p "require('./standalone/server/package.json').version")
          if [ "$WEBAPP" != "$SERVER" ]; then
            echo "::error::standalone/webapp is $WEBAPP but standalone/server is $SERVER"
            exit 1
          fi
          if [[ "$WEBAPP" == *-* || "$WEBAPP" == *+* ]]; then
            echo "::error::standalone version $WEBAPP is not strict SemVer MAJOR.MINOR.PATCH."
            exit 1
          fi
          if gh release view "v$WEBAPP" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
            echo "release=false" >> "$GITHUB_OUTPUT"
          else
            echo "release=true" >> "$GITHUB_OUTPUT"
          fi
          echo "version=$WEBAPP" >> "$GITHUB_OUTPUT"

  release:
    name: Retag, sign, release, deploy
    needs: [check]
    if: needs.check.outputs.release == 'true'
    runs-on: ubuntu-latest
    timeout-minutes: 15
    permissions:
      contents: write # tag + GitHub Release
      packages: write # retag images in GHCR
      id-token: write # OIDC for keyless cosign signing
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          ref: ${{ needs.check.outputs.sha }}

      - uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # v3.10.0
        with:
          # Pin cosign itself — cosign-installer@v3.x defaults to a
          # cosign v2.x release and we sign / publish-verify against
          # the v2 CLI surface. Cosign v3 changed the verify bundle
          # format; bumping requires cosign-installer@v4 AND updating
          # the verify instructions in the release-notes body below.
          cosign-release: v2.4.3

      - name: Retag and sign images
        env:
          VERSION: ${{ needs.check.outputs.version }}
          COMMIT_SHA: ${{ needs.check.outputs.sha }}
        run: |
          for IMAGE in \
            ghcr.io/ls1intum/apollon/webapp \
            ghcr.io/ls1intum/apollon/server; do
            docker buildx imagetools create --tag "$IMAGE:$VERSION" "$IMAGE:sha-$COMMIT_SHA"
            DIGEST=$(docker buildx imagetools inspect "$IMAGE:$VERSION" --format '{{.Manifest.Digest}}')
            cosign sign --yes "$IMAGE@$DIGEST"
          done

      - name: Ensure release tag exists
        env:
          VERSION: ${{ needs.check.outputs.version }}
          COMMIT_SHA: ${{ needs.check.outputs.sha }}
        run: |
          TAG="v${VERSION}"
          if git ls-remote --exit-code --tags origin "refs/tags/$TAG" >/dev/null 2>&1; then
            echo "Tag $TAG already exists on origin"
            exit 0
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag "$TAG" "$COMMIT_SHA"
          git push origin "refs/tags/$TAG"

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          VERSION: ${{ needs.check.outputs.version }}
          COMMIT_SHA: ${{ needs.check.outputs.sha }}
        run: |
          gh release create "v${VERSION}" \
            --title "v${VERSION}" \
            --target "$COMMIT_SHA" \
            --verify-tag \
            --latest \
            --generate-notes \
            --notes "## Docker images

          - \`ghcr.io/ls1intum/apollon/webapp:${VERSION}\`
          - \`ghcr.io/ls1intum/apollon/server:${VERSION}\`

          Signed with [Sigstore cosign](https://docs.sigstore.dev/cosign/verifying/verify/) (keyless, GitHub OIDC). Verify with:

          \`\`\`sh
          cosign verify ghcr.io/ls1intum/apollon/webapp:${VERSION} \\
            --certificate-identity-regexp='^https://github\\.com/ls1intum/Apollon/\\.github/workflows/release-standalone\\.yml@refs/heads/main\$' \\
            --certificate-oidc-issuer=https://token.actions.githubusercontent.com
          \`\`\`"