Adds @Cache-Control: no-store@ header to login, lost password, change password and sudo pages (#42998).

Patch by Go MAEDA (user:maeda).

git-svn-id: https://svn.redmine.org/redmine/trunk@23908 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/sudo_mode.rb

@@ -124,6 +124,7 @@ module Redmine
         @sudo_form.original_fields = params.slice(*param_names)
         # a simple 'render "sudo_mode/new"' works when used directly inside an
         # action, but not when called from a before_action:
+        no_store
         respond_to do |format|
           format.html {render 'sudo_mode/new'}
           format.js   {render 'sudo_mode/new'}