.gitlab-ci.yml

stages:
  - pre-build
  - build

list-tags:
  stage: pre-build
  only:
    - master
  image: everpeace/curl-jq
  variables:
    BASE_TAGS_API_URL: https://hub.docker.com/v2/repositories/drupaldocker/php/tags/?page_size=9999
    BASE_TAGS_FILTER: apache
  script:
    - curl --insecure --silent $BASE_TAGS_API_URL | jq '."results"[]["name"]' --raw-output | grep $BASE_TAGS_FILTER > tags_list.txt
  artifacts:
    untracked: true

.paralel-build: &paralel-build
  stage: build
  image: docker:latest
  services:
    - docker:dind
  only:
    - master
  variables:
    JOBS_NUMBER: 10
  script:
      # Select tags to process
    - export TAGS=$(awk "NR % $JOBS_NUMBER == ${CI_JOB_NAME#'build '}" tags_list.txt)
      # Login to image registry
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
    - |
      for TAG in ${TAGS//\\n/ }
      do
        docker build --pull -t "$CI_REGISTRY_IMAGE:$TAG" --build-arg "BASE_IMAGE_TAG=$TAG" .
        docker push "$CI_REGISTRY_IMAGE:$TAG"
      done

# Fake "build matrix" feature
build 0:
  <<: *paralel-build
build 1:
  <<: *paralel-build
build 2:
  <<: *paralel-build
build 3:
  <<: *paralel-build
build 4:
  <<: *paralel-build
build 5:
  <<: *paralel-build
build 6:
  <<: *paralel-build
build 7:
  <<: *paralel-build
build 8:
  <<: *paralel-build
build 9:
  <<: *paralel-build