Extend custom CSS cache time with digest paths (#33207)

config/initializers/settings_digests.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+Rails.application.config.to_prepare do
+  custom_css = begin
+    Setting.custom_css
+  rescue ActiveRecord::AdapterError # Running without a database, not migrated, no connection, etc
+    nil
+  end
+
+  if custom_css.present?
+    Rails
+      .cache
+      .write(
+        :setting_digest_custom_css,
+        Digest::SHA256.hexdigest(custom_css)
+      )
+  end
+end

config/routes.rb

@@ -55,7 +55,8 @@ Rails.application.routes.draw do
 
   get 'manifest', to: 'manifests#show', defaults: { format: 'json' }
   get 'intent', to: 'intents#show'
-  get 'custom.css', to: 'custom_css#show', as: :custom_css
+  get 'custom.css', to: 'custom_css#show'
+  resources :custom_css, only: :show, path: :css
 
   get 'remote_interaction_helper', to: 'remote_interaction_helper#index'