Prepare to support ruby 3.3.

lib/web_resource/engine.rb

@@ -1,6 +1,7 @@
 module WebResource
   class Engine < ::Rails::Engine
     initializer "web_resource" do
+      Rails.application.config.to_prepare do
         OrbitApp.registration "WebResource", :type => "ModuleApp" do
           module_label "web_resource.web_resource"
           base_url File.expand_path File.dirname(__FILE__)
@@ -56,3 +57,4 @@ module WebResource
       end
     end
   end
+end