Cache Google Chrome deb with generic packages rather than AWS

We currently cache Google Chrome deb files in AWS. Since GitLab 14.8
Generic Packages have become generally available. So in order to remove
the dependency on AWS and to dogfood the feature, we are going to cache
the Google Chrome deb files with GitLab

https://docs.gitlab.com/ee/user/packages/generic_packages/

.gitlab-ci.yml

@@ -23,14 +23,12 @@ variables:
   DOCKER_HOST: tcp://docker:2375
 
 cache-google-chrome:
+  image: ubuntu:16.04
   stage: automation
-  rules:
-    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   # Starts the job immediately
   needs: []
-  variables:
-    MOUNT_POINT: /builds/$CI_PROJECT_PATH/mnt
   script:
-    - mkdir -p "$MOUNT_POINT"
-    - cp scripts/cache-google-chrome $MOUNT_POINT
-    - docker run -e "AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID" -e "AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY" -v "$MOUNT_POINT:/mnt" ubuntu:16.04 /mnt/cache-google-chrome
+    - bash ./scripts/cache-google-chrome
+  # disable DinD
+  before_script: []
+  services: []