Merge branch 'rm-public-cache' into 'master'

Remove public/ directory from being cached

Closes gitlab-org/gitlab-ce#31278

See merge request !6081

.gitlab-ci.yml

@@ -7,9 +7,8 @@ before_script:
   - bundle install --jobs 4 --path vendor
 cache:
-  key: "website"
+  key: "web"
   paths:
-    - public
     - vendor
 stages: