Integration tests - migrate to controller-runtime env test

[grzesuav]

Currently integration tests are :

• downloading kube-apiserver, etcd, kubectl binary
• starts them
• install crds
• registers decorator/composite webhooks
• create resources and wait for results

The problematic part is managing binaries and the workflow.

Idea is to migrate to https://book.kubebuilder.io/reference/envtest.html and https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/envtest
as we would get rid of the burden of managing the binaries, also it provides some utility methods

[newtondev]

@grzesuav I can pick this one up, happy to discuss further on Slack if need be.

[grzesuav]

@newtondev feel free to pick it up, we have several functional tests which I think can be replaced by envtest, feel free to ping me on slack for discussion

[newtondev]

/assign

[newtondev]

Progress is coming along quite well. I have a small PoC that I will submit for review shortly.

[grzesuav]

sounds great !