Merge branch '4666-fix-precompiled-asset-favicon-green-ico' into 'master'

Fix "Asset was not declared to be precompiled in production" error with favicon-green.ico

Closes #4666

See merge request gitlab-org/gitlab-ee!4204

config/application.rb

@@ -121,6 +121,7 @@ module Gitlab
     config.assets.paths << "ee/app/assets/stylesheets"
 
     config.assets.precompile << "*.png"
+    config.assets.precompile << "*.ico"
     config.assets.precompile << "print.css"
     config.assets.precompile << "notify.css"
     config.assets.precompile << "mailers/*.css"