Multiple ways to create a Kubernetes controller:

• k8s http api
• k8s go api
• k8s client-go informer
• k8s client-go shared informer
• k8s go-generator for custom CRD

Note: If you intend to generate code then you will need the code-generator repo to exist in an old-style location. One easy way to do this is to use the command go mod vendor to create and populate the vendor directory.