name: Publish image

# Build and push the feeder image to the GitHub Container Registry (ghcr.io):
#   * every push to main  -> the moving `main` tag
#   * every `v*` tag       -> semver tags (e.g. v1.0.0 -> 1.0.0, 1.0, 1)
# The build context is the repo root (the workspace) so the vendored
# `meta-feeder-sdk` path dependency resolves; the Dockerfile lives under
# feeder-plugin/paper-feeder/.
on:
  push:
    branches: [main]
    tags: ['v*']

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  publish:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract image metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            # A fix to release 1.2.3 is tagged v1.2.3.1: four numbers are not semver, so
            # the pattern above makes no tag for it; this one does (image tag 1.2.3.1).
            type=match,pattern=v(\d+\.\d+\.\d+\.\d+),group=1
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha,format=short

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./feeder-plugin/europepmc-feeder/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max