Build the docker image by the gitlab ci

gitlab-ci.yml

build_images:
  stage: build_images
  image: docker
  services:
    - docker:dind
  variables:
    DOCKER_DRIVER: overlay2
  before_script:
    - docker info
  script:
    - tar -xvf target/universal/wzg-*.tgz -C ./target
    - docker build -t wzg:$CI_COMMIT_REF_NAME .
    - docker save wzg:$CI_COMMIT_REF_NAME > wzg-$CI_COMMIT_REF_NAME.tar
  artifacts:
    paths:
      - wzg-$CI_COMMIT_REF_NAME.tar
    expire_in: 1 week