build-target-image.yml

#  This workflow builds a specific regression test docker image.  Using the
#  input image short name from the workflow call, when the target image's
#  version.txt is changed, the image is rebuilt and pushed to ghcr.io

name: Build and Publish a target Image

on:
  workflow_call:
    inputs:
      image-short-name:
        required: true
        type: string
      notebook-name:
        required: true
        type: string
      shared-utils:
        required: true
        type: string
      lfs:
        required: true
        type: string

env:
  REGISTRY: ghcr.io

jobs:
  build-and-publish:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout regression test repository
        uses: actions/checkout@v4
        with:
          lfs: ${{inputs.lfs}}

      - name: Did this image's version change?
        uses: dorny/paths-filter@v3
        id: changes
        with:
          filters: |
            src:
              - ./test/${{inputs.image-short-name}}/version.txt

      - name: Extract semantic version number
        if: steps.changes.outputs.src == 'true'
        working-directory: ./test/${{inputs.image-short-name}}
        run: echo "semantic_version=$(cat version.txt)" >> $GITHUB_ENV

      - name: Log-in to ghcr.io registry
        if: steps.changes.outputs.src == 'true'
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Add tags to the Docker image
        if: steps.changes.outputs.src == 'true'
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: "${{ env.REGISTRY }}/${{github.repository_owner}}/regression-tests-${{ inputs.image-short-name }}"
          tags: |
            type=semver,pattern={{version}},value=${{ env.semantic_version }}

      - name: Set up Docker Buildx
        if: steps.changes.outputs.src == 'true'
        uses: docker/setup-buildx-action@v2
        with:
          driver-opts: |
            image=moby/buildkit:latest

      - name: Build and Push Docker image
        uses: docker/build-push-action@v3
        if: steps.changes.outputs.src == 'true'
        with:
          build-args: |
              notebook=${{inputs.notebook-name}}
              sub_dir=${{inputs.image-short-name}}
              shared_utils=${{inputs.shared-utils}}

          file: ./test/Dockerfile
          context: ./test
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Do nothing for this image
        if: steps.changes.outputs.src == 'false'
        run: echo "No changes required for this image ${{inputs.image-short-name}}"