add docker commands to image-building job template

  - compare

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

# name of child job determines name of image and name of dockerfile in ci/

# NOTE: this will only work once the container registry is activated in the project

.build-docker-image:

  stage: maintenance

  tags:

    - shell

  script:

    - echo "test"

    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY

    - IMAGE_LATEST=CI_REGISTRY_IMAGE/$CI_BUILD_NAME:latest

    - IMAGE_TAG=CI_REGISTRY_IMAGE/$CI_BUILD_NAME:$CI_COMMIT_SHORT_SHA

    - echo "Build $IMAGE_TAG"

    - docker build -t $IMAGE_TAG -t $IMAGE_LATEST -f ci/$CI_BUILD_NAME.dockerfile

    - docker push $IMAGE_LATEST

  rules:

    - if: $CI_COMMIT_REF_NAME != $CI_DEFAULT_BRANCH

      when: manual