CircleCI YML with proper docker build && deployment

circle.yml

machine:
  services:
    - docker
  environment:
    DOCKER_REGISTRY: example.com
    DOCKER_REPO: myproject
    DOCKER_USER: circleci
    DOCKER_EMAIL: [email protected]

dependencies:
  cache_directories:
    - "~/docker"
  override:
    - git fetch --unshallow || exit 0
    - pip install gitpython && wget https://gist.githubusercontent.com/ei-grad/e4e4dc563cffc0685d5a/raw/restore_commit_times.py && python restore_commit_times.py .
    - if [[ -e ~/docker/image.tar ]]; then docker load -i ~/docker/image.tar; fi
    - docker build -t $DOCKER_REGISTRY/$DOCKER_REPO:circleci-$CIRCLE_BUILD_NUM .
    - mkdir -p ~/docker; docker save $DOCKER_REGISTRY/$DOCKER_REPO:circleci-$CIRCLE_BUILD_NUM > ~/docker/image.tar

test:
  override:
    - docker run -it --rm $DOCKER_REGISTRY/$DOCKER_REPO:circleci-$CIRCLE_BUILD_NUM ./run_tests.sh

deployment:
  docker:
    branch: master
    commands:
      - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS $DOCKER_REGISTRY
      - docker push $DOCKER_REGISTRY/$DOCKER_REPO:circleci-$CIRCLE_BUILD_NUM