build-image.yml

name: Build the target Docker image

on:
  workflow_call:
    inputs:
      target_env:
        required: true
        type: string
        # choice is not available yet :(
        # type: choice
        # options:
        #   - production
        #   - extensions
      image_name:
        required: true
        type: string # image name without tag, e.g. 'openforms/open-forms'
      image_tag_prefix:
        required: true
        type: string
        default: ''
      extensions:
        required: true
        type: string
        default: ''
    outputs:
      image_name:
        description: Image name + tag of the built image
        value: ${{ jobs.image_build.outputs.image_name }}
      artifact_name:
        description: Artifact name for the built image
        value: ${{ jobs.image_build.outputs.artifact_name }}

jobs:
  image_build:
    name: Build image
    runs-on: ubuntu-latest

    env:
      COMPOSE_DOCKER_CLI_BUILD: 1
      DOCKER_BUILDKIT: 1

    outputs:
      image_name: ${{ steps.build-args.outputs.image_name }}
      artifact_name: ${{ steps.build-args.outputs.artifact_name }}

    steps:
      - uses: actions/checkout@v4

      - name: Extract build args
        id: build-args
        run: |
          # Strip git ref prefix from version
          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')

          # Strip "v" prefix from tag name (if present at all)
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')

          # Use Docker `latest` tag convention
          [ "$VERSION" == "master" ] && VERSION=latest

          # PRs result in version 'merge' -> transform that into 'latest'
          [ "$VERSION" == "merge" ] && VERSION=latest

          # Obtain the SDK release to bundle along, use latest if backend is also latest
          SDK_RELEASE=$(cat .sdk-release | tr -d '[:space:]')
          # TODO: check how this behaves with tag all-extensions-latest
          [ "$VERSION" == "latest" ] && SDK_RELEASE=latest

          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "sdk_release=${SDK_RELEASE}" >> $GITHUB_OUTPUT
          echo "image_name=${{ inputs.image_name }}:${{ inputs.image_tag_prefix }}${VERSION}" >> $GITHUB_OUTPUT
          echo "artifact_name=docker-image-${{ inputs.image_tag_prefix }}${VERSION}" >> $GITHUB_OUTPUT

      - name: Build the Docker image
        run: |
          docker build . \
            --tag ${{ steps.build-args.outputs.image_name }} \
            --build-arg TARGET_ENVIRONMENT=${{ inputs.target_env }} \
            --build-arg EXTENSIONS=${{ inputs.extensions }} \
            --build-arg SDK_RELEASE=${{ steps.build-args.outputs.sdk_release }} \
            --build-arg COMMIT_HASH=${GITHUB_SHA} \
            --build-arg RELEASE=${{ steps.build-args.outputs.version }}

      - name: Dump image to file
        run: docker image save -o image.tar ${{ steps.build-args.outputs.image_name }}

      - name: Store image artifact
        uses: actions/upload-artifact@v4
        with:
          name: ${{ steps.build-args.outputs.artifact_name }}
          path: image.tar
          retention-days: 1