add template for building docker images

  - test

  - compare

# template for job that builds docker images and pushes them to the container registry (once enabled)

.build-docker-image:

  stage: maintenance

  tags:

    - shell

  script:

    - echo "test"

  rules:

    - if: $CI_COMMIT_REF_NAME != $CI_DEFAULT_BRANCH

      when: manual

      allow_failure: true

    - if: $CI_PIPELINE_SOURCE == "merge_request_event" || $CI_PIPELINE_SOURCE == "push"

      changes:

        - ci/*dockerfile

ubuntu_22.04:

  extends: .build-docker-image

# temporary test job to see whether everything works with the docker runner

test-job-docker-runner:

  stage: test