image: docker:cli

services:
  - docker:dind

stages:
  - build
  - deploy

build:
  stage: build
  script:
    - docker build -t $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG .
  # Run this job in a branch where a Dockerfile exists
  rules:
    - if: $CI_COMMIT_BRANCH
      exists:
        - Dockerfile

deploy:
  stage: deploy
  script:
    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
  tags:
    - docker
  only:
    - tags
  when: on_success