Fix docker build

    - docker:19.03.1-dind

  script:

  - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME || true

  - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CI_REGISTRY

  - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY

  - docker build --cache-from $CI_REGISTRY_IMAGE:latest -t $CI_REGISTRY_IMAGE -t $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME .

  - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME

  - if [ "${CI_COMMIT_REF_NAME}" = master ] ; then docker push $CI_REGISTRY_IMAGE:latest ; fi