.gitlab-ci.yml

image: docker:git

services:
  - docker:dind

build:
  stage: build
  before_script:
    # $CI_JOB_TOKEN is variable automatically added by Gitlab: see https://docs.gitlab.com/ee/ci/variables/predefined_variables.html#variables-reference
    - echo $CI_JOB_TOKEN | docker login -u gitlab-ci-token registry.gitlab.com --password-stdin
  script:
    - docker pull $GITLAB_IMAGE || true # Allows us to use --cache-from
    - docker build --cache-from $GITLAB_IMAGE -t $GITLAB_IMAGE:$CI_COMMIT_SHA .
    - docker push $GITLAB_IMAGE:$CI_COMMIT_SHA

deploy:
  stage: deploy
  before_script:
    # Login to Gitlab registry
    - echo $CI_JOB_TOKEN | docker login -u gitlab-ci-token registry.gitlab.com --password-stdin
    # Login to Google Cloud Registry
    - echo $GOOGLE_CLOUD_ACCOUNT | docker login -u _json_key --password-stdin https://eu.gcr.io
  script:
    - docker pull $GITLAB_IMAGE:$CI_COMMIT_SHA
    - docker tag $GITLAB_IMAGE:$CI_COMMIT_SHA $GCR_IMAGE:latest
    - docker push $GCR_IMAGE