stages:
  - build
  - push

build:
  stage: build
  image: ruby:latest
  before_script:
    - gem install bundler:1.17.2
    - bundle install
  script:
    - bundle exec jekyll build
  artifacts:
    paths:
      - _site

push:
  stage: push
  only:
    - master
  image: docker:stable
  services:
    - docker:dind
  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_DRIVER: overlay2
  before_script:
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
  script:
    - docker build -t $CI_REGISTRY_IMAGE:latest .
    - docker push $CI_REGISTRY_IMAGE:latest
    - docker tag $CI_REGISTRY_IMAGE:latest $CI_REGISTRY_IMAGE:ci-$CI_COMMIT_SHA
    - docker push $CI_REGISTRY_IMAGE:ci-$CI_COMMIT_SHA