image: docker:latest

services:
  - docker:dind

before_script:
  - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY

build-master:
  stage: build
  script:
    - docker pull "$CI_REGISTRY_IMAGE:latest" || true
    - docker build --cache-from "$CI_REGISTRY_IMAGE:latest" --pull -t "$CI_REGISTRY_IMAGE:latest" .
    - docker push "$CI_REGISTRY_IMAGE:latest"
  only:
    - master
    - schedules

build-master-tag:
  stage: build
  script:
    - docker build --pull -t $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG .
    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
  only:
    - tags
    - schedules
    - master
  except:
    - branches

build:
  stage: build
  script:
    - docker pull "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" || true
    - docker build --cache-from "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" .
    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
  except:
    - master
  only:
    - branches