Expire Rails cache entries after two weeks

This should help prevent endless Redis growth.

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
+v 7.14.0 (unreleased)
+  - Expire Rails cache entries after two weeks to prevent endless Redis growth
+
 v 7.13.0 (unreleased)
   - Only enable HSTS header for HTTPS and port 443 (Stan Hu)
   - Fix user autocomplete for unauthenticated users accessing public projects (Stan Hu)

config/application.rb

@@ -96,6 +96,7 @@ module Gitlab
     end
 
     redis_config_hash[:namespace] = 'cache:gitlab'
+    redis_config_hash[:expires_in] = 2.weeks # Cache should not grow forever
     config.cache_store = :redis_store, redis_config_hash
 
     # This is needed for gitlab-shell