name: PR Docker Build

on:
  pull_request:
    branches: [main]
    types: [opened, synchronize]
    paths-ignore:
      - "**.md"
      - ".github/**"

jobs:
  build-pr:
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      packages: write
      pull-requests: write
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v4
        with:
          tags: ghcr.io/pocket-id/pocket-id:pr-${{ github.event.pull_request.number }}
          context: .
          platforms: linux/amd64, linux/arm64
          push: true
          labels: |
            org.opencontainers.image.title=Pocket ID - PR #${{ github.event.pull_request.number }}
            org.opencontainers.image.description=PR Build for ${{ github.event.pull_request.title }}
            org.opencontainers.image.source=${{ github.event.pull_request.html_url }}

      - name: Update PR Description
        if: github.event.action == 'opened'
        uses: nefrob/pr-description@v1.2.0
        with:
          content: "\n\n---\nDocker image for this PR is available at `ghcr.io/pocket-id/pocket-id:pr-${{ github.event.pull_request.number }}`"
          token: ${{ secrets.GITHUB_TOKEN }}