container-image.yml

name: Docker Image CI

on:
  workflow_dispatch:
  push:
    branches: [ "main" ]
  pull_request:
    branches: [ "main" ]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  TAG: "3.1"

jobs:

  main-root:
    outputs:
      is-main: ${{ steps.is-main-root.outputs.test }}
    runs-on: ubuntu-latest
    steps:
      - name: Echo a message
        if: github.ref == 'refs/heads/main' && github.repository == 'commonhaus/pandoc-pdf'
        id: is-main-root
        run: echo "test=true" >> "$GITHUB_OUTPUT"

  build:
    needs: main-root
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v3

    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v4
      with:
        images: ${{ github.repository }}
        tags: |
          type=raw,enable=true,priority=200,prefix=,suffix=,value=${{ env.TAG }}

    - name: Log in to the Container registry
      if: ${{needs.main-root.outputs.is-main}}
      uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build and push Docker image
      uses: docker/build-push-action@v6.9.0
      with:
        context: .
        push: false
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
      

    - name: Publish OCI image to GCR
      if: ${{needs.main-root.outputs.is-main}}
      id: publish-oci
      run: |
        image="${IMAGE_NAME}:${TAG}"
        docker tag "${image}" "ghcr.io/${image}"
        docker push "ghcr.io/${image}"