name: Docker

on:
    push:
        # Publish `v1.2.3` tags as releases.
        tags:
            - v*

    # Run tests for all PRs to master.
    pull_request:
        branches:
            - master

jobs:
    docker:
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v4
            - uses: docker/setup-qemu-action@v3
            - uses: docker/setup-buildx-action@v3
            - name: Login to GitHub Container Registry
              if: github.event_name != 'pull_request'
              uses: docker/login-action@v3
              with:
                  registry: ghcr.io
                  username: ${{ github.repository_owner }}
                  password: ${{ secrets.GITHUB_TOKEN }}
            - uses: docker/metadata-action@v5
              if: github.ref_type == 'tag'
              id: meta
              with:
                  images: ghcr.io/${{ github.repository }}
                  # this will generate tags in the following format:
                  #
                  # latest
                  # 1
                  # 1.2
                  # 1.2.3
                  tags: |
                      type=raw,value=latest
                      type=semver,pattern={{major}}
                      type=semver,pattern={{major}}.{{minor}}
                      type=semver,pattern={{version}}
            - uses: docker/build-push-action@v5
              if: github.ref_type == 'tag'
              with:
                  context: .
                  push: true
                  pull: true
                  tags: ${{ steps.meta.outputs.tags }}
                  labels: ${{ steps.meta.outputs.labels }}
            - uses: docker/build-push-action@v5
              if: github.ref_type == 'branch'
              with:
                  context: .
                  push: false
                  pull: true