.gitlab-ci.yml

default:
  image: docker
  services:
    - name: docker:dind
      alias: docker

stages:
  - publish

before_script:
  - echo -n $CI_JOB_TOKEN | docker login -u gitlab-ci-token --password-stdin $CI_REGISTRY

publish:image:
  stage: publish
  variables:
    CI_DOCKER_NAME: ${CI_REGISTRY_IMAGE}/cats
  script:
    - docker pull $CI_REGISTRY_IMAGE || true
    - docker build --pull --cache-from $CI_REGISTRY_IMAGE --tag $CI_DOCKER_NAME .
    - docker push $CI_DOCKER_NAME