publish.yaml

name: Release and Publish to Google Artifact Registry

permissions:
  id-token: write
  contents: read

on:
  push:
    tags:
      - "v*.*.*"

jobs:
  publish-gar:
    name: Build and Publish to GAR
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Validate tag format
        env:
          TAG: ${{ github.ref_name }}
        run: |
          VERSION="${TAG#v}"
          if ! [[ $VERSION =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Error: Invalid version format '$VERSION'. Expected format: x.y.z"
            exit 1
          fi
          echo "Releasing version: $VERSION (from tag: $TAG)"

      - name: Verify GitHub Release exists
        env:
          GH_TOKEN: ${{ github.token }}
          TAG: ${{ github.ref_name }}
        run: |
          if ! gh release view "$TAG" --repo "$GITHUB_REPOSITORY" > /dev/null 2>&1; then
            echo "Error: No GitHub Release found for tag '$TAG'."
            echo "Create a release via GitHub UI instead of pushing tags manually."
            exit 1
          fi

      - name: Verify tag is on master
        env:
          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
        run: |
          git fetch origin "$DEFAULT_BRANCH" --quiet
          if ! git merge-base --is-ancestor "$GITHUB_SHA" "origin/$DEFAULT_BRANCH"; then
            echo "Error: Tag commit $GITHUB_SHA is not reachable from origin/$DEFAULT_BRANCH."
            echo "Only tags on the $DEFAULT_BRANCH branch can be published."
            exit 1
          fi

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.x"

      - name: Install build dependencies
        run: pip install build twine setuptools-scm

      - name: Authenticate to Google Cloud
        id: auth
        uses: google-github-actions/auth@v3
        with:
          token_format: "access_token"
          workload_identity_provider: "projects/668763687485/locations/global/workloadIdentityPools/github/providers/github"
          service_account: "github-experimentation@optimizely-iac.iam.gserviceaccount.com"

      - name: Build and Publish
        run: |
          python -m build
          python -m twine upload \
            --repository-url https://us-east1-python.pkg.dev/artifact-registry-e3ca/private-python/ \
            --username oauth2accesstoken \
            --password ${{ steps.auth.outputs.access_token }} \
            dist/*