.gitlab-ci.yml

variables:
  GIT_SUBMODULE_STRATEGY: recursive
  DOCKER_IMAGE: 'docker:latest'
  FOLDER_TO_BUILD: '.'

stages:
  - trigger
  - build
  - docker-push

trigger-pipeline:
  stage: trigger
  script:
    - echo "Manual trigger to start the pipeline."
  when: manual

.docker-stage:
  image: $DOCKER_IMAGE
  services:
    - docker:dind
  before_script:
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY

docker-build:
  extends: .docker-stage
  stage: build
  before_script:
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
  script:
    - docker pull "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" || true
    - docker pull "$CI_REGISTRY_IMAGE:latest" || true
    - docker build --pull --cache-from "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" --cache-from "$CI_REGISTRY_IMAGE:latest" -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" "$FOLDER_TO_BUILD"
    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA"
    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
  when: on_success

docker-push-latest:
  extends: .docker-stage
  stage: docker-push
  script:
    - docker pull "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA"
    - docker tag "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" "$CI_REGISTRY_IMAGE:latest"
    - docker push "$CI_REGISTRY_IMAGE:latest"
  rules:
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
      when: on_success