[deploy] Delete all cookies when signing out (#10036)

app/controllers/sessions_controller.rb

@@ -0,0 +1,9 @@
+class SessionsController < Devise::SessionsController
+  def destroy
+    # Let's say goodbye to all the cookies when someone signs out.
+    cookies.each do |cookie|
+      cookies.delete cookie[0]
+    end
+    super
+  end
+end

config/routes.rb

@@ -8,7 +8,8 @@ Rails.application.routes.draw do
   devise_for :users, controllers: {
     omniauth_callbacks: "omniauth_callbacks",
     registrations: "registrations",
-    invitations: "invitations"
+    invitations: "invitations",
+    sessions: "sessions"
   }
 
   devise_scope :user do