Update .gitlab-ci.yml file

  services:

    - docker:dind

  before_script:

    - git config --global http.sslVerify false

    - echo "$CI_REGISTRY_PASSWORD" | docker login glcr.cra.ac.cn --username "$CI_REGISTRY_USER" --password-stdin

  # Default branch leaves tag empty (= latest tag)

  # All other branches are tagged with the escaped branch name (commit ref slug)