Replace all registry.gitlab.com with environment variables

We have synchronized all images from registry.gitlab.com, now we need to replace the domain name of image in the YML file with the environment variable. Like this

.compile-assets-base:
  extends:
    - .default-retry
    - .default-before_script
    - .assets-compile-cache
  image: ${REGISTRY_HOST}/${REGISTRY_GROUP}/gitlab-build-images:debian-${DEBIAN_VERSION}-ruby-2.7-git-2.33-lfs-2.9-node-14.15-yarn-1.22-graphicsmagick-1.3.36
  variables:
    SETUP_DB: "false"
    WEBPACK_VENDOR_DLL: "true"
    # Disable warnings in browserslist which can break on backports
    # https://github.com/browserslist/browserslist/blob/a287ec6/node.js#L367-L384
    BROWSERSLIST_IGNORE_OLD_DATA: "true"
  stage: prepare
  script:
    - *yarn-install
    - run_timed_command "bin/rake gitlab:assets:compile"
    - run_timed_command "scripts/clean-old-cached-assets"

related issue: #347 (closed)