I'm looking for an alternative for setting kubernetes + tooling around it to deploy user submitted(by virtue of read acess to Github) Dockerfiles safely/sandbox

I'm looking for an alternative for setting kubernetes + tooling around it to deploy user submitted(by virtue of read acess to Github) Dockerfiles safely/sandboxed. eg Svix lets you embed the entire webhook manager to your customers to allow them to self-serve. eg fileupload sdk's abstract away the upload/implementation. am looking for an equivalent of this but for dockerfiles/container mgmt. Being able to offer hosting dockerfile & containers, without having to do it myself :)