Fix settings pages being cacheable by the browser (#12714)

Fix #12255

app/controllers/auth/registrations_controller.rb

@@ -10,6 +10,7 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   before_action :set_instance_presenter, only: [:new, :create, :update]
   before_action :set_body_classes, only: [:new, :create, :edit, :update]
   before_action :require_not_suspended!, only: [:update]
+  before_action :set_cache_headers, only: [:edit, :update]
 
   skip_before_action :require_functional!, only: [:edit, :update]
 
@@ -109,4 +110,8 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   def require_not_suspended!
     forbidden if current_account.suspended?
   end
+
+  def set_cache_headers
+    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+  end
 end