docker_build.yaml

name: Build and push docker image

on:
  workflow_call:
    inputs:
      base_image_name:
        required: true
        type: string
        description: Base name of the image to build and push
    outputs:
      image_name:
        description: String that represents the built image name
        value: ${{ jobs.docker_build_and_push.outputs.image_name }}

jobs:
  docker_build_and_push:
    runs-on: ubuntu-latest
    outputs:
      image_name: ${{ fromJson(steps.meta.outputs.json).tags[0] }}
    steps:
      - name: Free Disk Space (Ubuntu)
        uses: jlumbroso/free-disk-space@main
        with:
          large-packages: false
          docker-images: false
      - name: Checkout repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          lfs: true
          persist-credentials: false
      # lfs=true is not enough, see https://stackoverflow.com/questions/61463578/github-actions-actions-checkoutv2-lfs-true-flag-not-converting-pointers-to-act
      - name: Pull LFS Objects
        run: git lfs pull
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Login to GAR
        uses: docker/login-action@v3
        with:
          registry: europe-west3-docker.pkg.dev
          username: _json_key
          password: ${{ secrets.GAR_JSON_KEY }}
      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ inputs.base_image_name }}
          tags: |
            type=sha
            # set latest tag for default branch
            type=raw,value=latest,enable={{is_default_branch}}
      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ inputs.base_image_name }}:latest
          cache-to: type=inline