DEV: make it possible to enable cdn in development environment.

app/helpers/application_helper.rb

@@ -77,7 +77,7 @@ module ApplicationHelper
         path = path.gsub(/\.([^.]+)$/, '.gz.\1')
       end
 
-    elsif GlobalSetting.cdn_url&.start_with?("https") && is_brotli_req?
+    elsif GlobalSetting.cdn_url&.start_with?("https") && is_brotli_req? && Rails.env != "development"
       path = path.gsub("#{GlobalSetting.cdn_url}/assets/", "#{GlobalSetting.cdn_url}/brotli_asset/")
     end
 

config/environments/development.rb

@@ -15,6 +15,8 @@ Discourse::Application.configure do
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
 
+  config.action_controller.asset_host = GlobalSetting.cdn_url
+
   # Print deprecation notices to the Rails logger
   config.active_support.deprecation = :log