image: docker:cli

services:
  - docker:dind

stages:
  - build
  - deploy


variables:
  DOCKER_IMAGE_NAME: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG

build:
  stage: build
  before_script:
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
  script:
      - docker build --pull -t "$DOCKER_IMAGE_NAME" .
      - docker push "$DOCKER_IMAGE_NAME"
      - |
        if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
          docker tag "$DOCKER_IMAGE_NAME" "$CI_REGISTRY_IMAGE:latest"
          docker push "$CI_REGISTRY_IMAGE:latest"
        fi
  # Run this job in a branch where a Dockerfile exists
  rules:
    - if: $CI_COMMIT_BRANCH
      exists:
        - Dockerfile

deploy:
  stage: deploy
  before_script:
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
  script:
    - docker pull $CI_REGISTRY_IMAGE:latest
    - docker tag $CI_REGISTRY_IMAGE:latest $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
  only:
    - tags
  when: on_success