Gitlab CICD

.gitlab-ci.yml

build_image:
  image: docker:git
  services:
  - docker:dind
  script:
    # Login to Gitlab Registry
    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
    # Build image
    - docker build -t registry.gitlab.com/<username>/<repo-name>/<docker-name>:latest --build-arg env=sandbox --build-arg <SOME-ARG>=<VALUE> .  
    # Then push image
    - docker push registry.gitlab.com/<username>/<repo-name>/<docker-name>:latest
  only:
    - sandbox
build_app_image:
  image: docker:git
  services:
  - docker:dind
  script:
    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
    - docker build -t registry.gitlab.com/<username>/<repo-name>/<docker-name>:latest --build-arg env=prod --build-arg <SOME-ARG>=<VALUE> .  
    - docker push registry.gitlab.com/<username>/<repo-name>/<docker-name>:latest
  only:
    - master