name: publish docker image

on:
  push:
    tags:
      - 'v*'

jobs:
  push_to_registry:
    name: Docker
    runs-on: ubuntu-latest
    steps:
    - name: Check out the repo
      uses: actions/checkout@v3

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1

    - name: Set up Docker Buildx
      id: buildx
      uses: docker/setup-buildx-action@v1

    - name: Log in to GitHub Container Registry
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v3
      with:
        images: ghcr.io/${{ github.repository }}

    - name: Build and push Docker image
      uses: docker/build-push-action@v2
      with:
        context: .
        platforms: linux/amd64
        builder: ${{ steps.buildx.outputs.name }}
        push: ${{ github.event_name != 'pull_request' }}
        tags: |
          ghcr.io/${{ github.repository }}:latest
          ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=gha
        cache-to: type=gha,mode=max
