Adds @no_store@ method to ActionController because Rails < 6 does not have this method (#42998).

Patch by Go MAEDA (user:maeda).

git-svn-id: https://svn.redmine.org/redmine/branches/5.1-stable@23910 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/initializers/10-patches.rb

@@ -156,6 +156,14 @@ module ActionController
   end
 end
 
+module ActionController
+  module ConditionalGet
+    def no_store
+      response.cache_control.replace(no_store: true)
+    end
+  end
+end
+
 # Adds asset_id parameters to assets like Rails 3 to invalidate caches in browser
 module ActionView
   module Helpers