element-call-Github/.github/workflows/docker-pr.yaml

name: Docker PR Preview
# Note pushing docker images is not possible from a public forked repo (see: Can't push to ghcr on a pull request, https://github.com/docker/build-push-action/issues/870)
# Hence, this workflow is limited to PRs from element-hq/element-call

on:
  pull_request:
    types:
      - synchronize
      - opened
      - labeled

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  # due to https://github.com/actions/runner/issues/2372
  # and not wanting to workaround like https://stackoverflow.com/questions/73797254/environment-variables-in-github-actions/74217028#74217028
  # we disable for now a gloabl env variable since env is not available in job.if
  # DO_DOCKER_BUILD: ${{ contains(github.event.pull_request.labels.*.name, 'docker build') }}
  # NOT_FROM_FORK: ${{ github.event.pull_request.head.repo.full_name == github.repository }}

jobs:
  build_element_call:
    if: ${{ contains(github.event.pull_request.labels.*.name, 'docker build') && github.event.pull_request.head.repo.full_name == github.repository }}
    uses: ./.github/workflows/element-call.yaml
    secrets:
      SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
      SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
      SENTRY_URL: ${{ secrets.SENTRY_URL }}
      SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}

  build_docker:
    if: ${{ contains(github.event.pull_request.labels.*.name, 'docker build') && github.event.pull_request.head.repo.full_name == github.repository }}
    needs: build_element_call
    runs-on: ubuntu-latest
    permissions:
      contents: write # required to upload release asset
      packages: write
    steps:
      - name: Check it out
        uses: actions/checkout@v4

      - name: 📥 Download artifact
        uses: actions/download-artifact@v4
        with:
          name: build-output
          path: dist

      - name: Log in to container registry
        uses: docker/login-action@5f4866a30a54f16a52d2ecb4a3898e9e424939cf
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@c314eea2b27e3cb3c7d7be0618510234d8f6178e
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha,format=short,event=branch
            type=raw,value=pr_${{ github.event.pull_request.number }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb

      - name: Build and push Docker image
        uses: docker/build-push-action@f8bc7f46003ef0cf98b715743d86c2f1ccd01436
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}