name: build

on:
  push:
    branches:
      - 'release/*'
    tags:
      - 'v*'
  pull_request:

env:
  DOCKERHUB_SLUG: distribution/distribution

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 0
      -
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: |
            ${{ env.DOCKERHUB_SLUG }}
          ### versioning strategy
          ### push semver tag v2.9.0 on main (default branch)
          # distribution/distribution:2.9.0
          # distribution/distribution:latest
          ### push semver tag v2.8.0 on release/2.8 branch
          # distribution/distribution:2.8.0
          ### push on main
          # distribution/distribution:edge
          tags: |
            type=semver,pattern={{version}}
            type=ref,event=pr
          # don't create latest tag on release/2.x
          flavor: |
            latest=false
          labels: |
            org.opencontainers.image.title=Distribution
            org.opencontainers.image.description=The toolkit to pack, ship, store, and deliver container content
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build image
        uses: docker/bake-action@v1
        with:
          files: |
            ./docker-bake.hcl
            ${{ steps.meta.outputs.bake-file }}
          targets: image-all
          push: ${{ startsWith(github.ref, 'refs/tags/') }}