Add configuration foward-auth headers

db/migrate/20251026033102_add_headers_config_to_forward_auth_rule.rb

@@ -0,0 +1,5 @@
+class AddHeadersConfigToForwardAuthRule < ActiveRecord::Migration[8.1]
+  def change
+    add_column :forward_auth_rules, :headers_config, :json, default: {}, null: false
+  end
+end