Sandbox app to run code inside kubernetis?

Question

Kubernetes

You need something that will get into kubernetis from half a kick to execute untrusted code, which can be easily called via api.
I want to do something like ejudje or sandbox so that users can run their code. But so that there is no access to the network and nothing could break with me.
A lot of things, but something doesn’t get into Kuber and wants a full-fledged vm, something doesn’t have an api and you need to run docker inside docker (does it work like that?), something is not credible.