name: Publish Docker image to Dockerhub

on:
  workflow_dispatch:
  push:
# uncomment to auto build when commits are pushed to listed branches
#    branches:
#      - 'master'
    tags:
      - '*.*.*'
    # don't trigger if just updating docs
    paths-ignore:
      - 'README.md'
      - '.github/**'

jobs:
  push_to_registry:
    name: Build and push container images
    if: ${{ github.event_name != 'pull_request' && (vars.GHCR_IMAGE_NAME != '' || vars.DOCKERHUB_IMAGE_NAME != '' ) }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - dockerfile: ./Dockerfile
            suffix: ''
            platforms: 'linux/amd64,linux/arm64'
    # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
    permissions:
      packages: write
      contents: read
    steps:
      - name: Check out the repo
        uses: actions/checkout@v4

# uncomment to enable dockerhub
      
#      - name: Log in to Docker Hub
#        uses: docker/login-action@v3
#        with:
#          username: ${{ secrets.DOCKER_USERNAME }}
#          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          # add to images list to enable dockerhub ${{ vars.DOCKERHUB_IMAGE_NAME }}
          images: |
            ${{ vars.GHCR_IMAGE_NAME }}
          # generate Docker tags based on the following events/attributes
          # https://github.com/docker/metadata-action/issues/247#issuecomment-1511259674 for NOT is default branch, eventually
          tags: |
            type=raw,value=latest,enable={{is_default_branch}},suffix=${{ matrix.suffix }}
            type=ref,event=branch,enable=${{ !endsWith(github.ref, 'master') }},suffix=${{ matrix.suffix }}
            type=semver,pattern={{version}},suffix=${{ matrix.suffix }}
          flavor: |
            latest=false

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

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

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ${{ matrix.dockerfile }}
          push: ${{ !env.ACT}}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: ${{ matrix.platforms }}