Revert "Remove unused private function"

This reverts commit 31a6e5c.

Author: cwlbraa

app/models/runtime/domain.rb

@@ -149,6 +149,10 @@ def protocols
 
     private
 
+    def k8s_enabled?
+      Config.config.kubernetes_api_configured?
+    end
+
     def validate_change_owning_organization(organization)
       return if self.new? || owning_organization == organization