name: Build Docker Image

on:
  # run it during pull request
  pull_request:
      
  workflow_dispatch:

jobs:
  # define job to build and publish docker image
  build-docker-image:
    name: Build Docker image only
    # run only when code is compiling and tests are passing
    runs-on: ubuntu-latest

    # steps to perform in job
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Test CRON validation.
        run: bash docker/src/tests/test-cron-validation.sh

      - name: Force permissions fix.
        run: sudo apt-get update && sudo apt-get install dos2unix -y && cd docker && bash dos2unix.sh

      # setup Docker build action
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v3
      
      - name: Build image only
        uses: docker/build-push-action@v6
        with:
          context: ./docker
          push: false

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}