feature: add volume cleanup behaviour and optimize setup defaults procedure #21
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Fixes #16
What this PR does?
This PR aims to provide users choices for retain or delete volumes after deleting CRs. Users can use following configurations to control this behaviour.
How so?
Basically, I added finalizers to CR for controllers to implement asynchronous pre-delete hooks. In this pre-delete hook, I cleanup all binded PVCs and orphaned PVCs as well.
See https://book.kubebuilder.io/reference/using-finalizers to learn the context.