GitLab CI config file to build docker images

.gitlab-ci.yml

image: docker:git

services:
  - docker:dind
variables:
  DOCKER_DRIVER: overlay

before_script:
  - docker login -u gitlab-ci-token -p "$CI_BUILD_TOKEN" "$CI_REGISTRY"

development:
  stage: deploy
  script:
    - docker build -t "$CI_REGISTRY_IMAGE:dev" .
    - docker push "$CI_REGISTRY_IMAGE:dev"
  only:
    - develop

stable:
  stage: deploy
  script:
    - docker build -t "$CI_REGISTRY_IMAGE:stable" .
    - docker push "$CI_REGISTRY_IMAGE:stable"
  only:
    - master