- export REQ_HASH=$( md5sum requirements.txt | awk '{print $1}')
    - export REGISTRY=$CI_REGISTRY/$(echo $CI_PROJECT_PATH | awk '{print tolower($0)}')
    - docker version
    - 'echo Requirements hash: $REQ_HASH'
    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CI_REGISTRY
    - >
      if ! docker pull $REGISTRY/requirements:$REQ_HASH; then
       docker build -t $REGISTRY/requirements:$REQ_HASH --file Dockerfile.requirements .
       docker push $REGISTRY/requirements:$REQ_HASH
      fi
    - >
      docker build -t $REGISTRY/app:$CI_COMMIT_SHA
      --build-arg PATH=$REGISTRY/requirements
      --build-arg REQ_HASH=$REQ_HASH
      --file Dockerfile.app .
    - docker push ${REGISTRY}/app:${CI_COMMIT_SHA}
    - docker logout ${CI_REGISTRY}