name: Docker

on:
  push:
    branches: [ "main" ]
    # Publish semver tags as releases.
    tags: [ 'v*.*.*' ]
  pull_request:
    branches: [ "main" ]

env:
  REGISTRY: ${{ forgejo.server_url }}
  IMAGE_NAME: ${{ forgejo.repository }}

jobs:
  build:

    runs-on: ubuntu-docker
    container:
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock

    steps:
      - name: Checkout repository
        uses: https://code.forgejo.org/actions/checkout@v4

      # Set up BuildKit Docker container builder to be able to build
      # multi-platform images and export cache
      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker Buildx
        uses: https://github.com/docker/setup-buildx-action@v3

      # Login against the Forgejo container registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: forgejo.event_name != 'pull_request'
        uses: https://github.com/docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ forgejo.actor }}
          password: ${{ secrets.FORGEJO_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: https://github.com/docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: https://github.com/docker/build-push-action@v5
        with:
          context: .
          push: ${{ forgejo.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}