Add mast operator to list (#37355)

* Add mast operator to list

#37354 - link to mast Operator

* Update operator.md

Change order to alphabetical

* Update operator.md

Author: kivio

content/en/docs/concepts/extend-kubernetes/operator.md

@@ -119,6 +119,7 @@ operator.
 * [kubebuilder](https://book.kubebuilder.io/)
 * [KubeOps](https://buehler.github.io/dotnet-operator-sdk/) (.NET operator SDK)
 * [KUDO](https://kudo.dev/) (Kubernetes Universal Declarative Operator)
+* [Mast](https://docs.ansi.services/mast/user_guide/operator/)
 * [Metacontroller](https://metacontroller.github.io/metacontroller/intro.html) along with WebHooks that
   you implement yourself
 * [Operator Framework](https://operatorframework.io)