Converting service fabric actors to kubernetes
To use actor programming model on k8s you should use the combination of actor framework (orleans or akka.net) and k8s stateful sets.
Talk from Oslo NDC 2019 Real-Time, Distributed Applications with Akka.NET, Kubernetes and .NET Core
Have a look at dapr runtime. It is heavily influenced by Microsoft's learning of Service Fabric Reliable Services/Actors and runs on top of Kubernetes (and others).
Take into account that it is still in development and not yet released for production scenarios.