name: Publish Docker image

# Two channels, not one-image-per-commit:
#   - push to `dev`   -> rolling `:dev` tag, for testing in-progress work
#   - push tag `v*`   -> `:latest` + the version tag, for actual releases
# Plain commits/merges to master/main build nothing on their own.
on:
  push:
    branches: [dev]
    tags: ['v*']

permissions:
  contents: read
  packages: write

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - name: Compute lowercase image name
        run: echo "IMAGE_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_ENV"

      - name: Compute image tags
        run: |
          if [ "${{ github.ref_type }}" = "tag" ]; then
            VERSION="${{ github.ref_name }}"
            TAGS="${{ vars.REGISTRY_HOST }}/${IMAGE_NAME}:latest
          ${{ vars.REGISTRY_HOST }}/${IMAGE_NAME}:${VERSION}
          ghcr.io/${IMAGE_NAME}:latest
          ghcr.io/${IMAGE_NAME}:${VERSION}"
          else
            TAGS="${{ vars.REGISTRY_HOST }}/${IMAGE_NAME}:dev
          ghcr.io/${IMAGE_NAME}:dev"
          fi
          {
            echo "TAGS<<TAGS_EOF"
            echo "$TAGS"
            echo "TAGS_EOF"
          } >> "$GITHUB_ENV"

      - name: Log in to Gitea container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ vars.REGISTRY_HOST }}
          username: ${{ github.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GHCR_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ env.TAGS }}