image: docker:git

services:
- docker:dind

variables:
  DOCKER_DRIVER: overlay

before_script:
  - docker login -u "gitlab-ci-token" -p "$CI_BUILD_TOKEN" registry.gitlab.com

.build_and_deploy: &build_and_deploy
  stage: build
  script:
    - docker build -t "$CI_REGISTRY_IMAGE:$CI_BUILD_NAME" -f "Dockerfile.$CI_BUILD_NAME" .
    - docker push "$CI_REGISTRY_IMAGE:$CI_BUILD_NAME"

ruby-2.1: *build_and_deploy
ruby-2.2: *build_and_deploy
ruby-2.3: *build_and_deploy
www-gitlab-com: *build_and_deploy