Evaluate Kyverno mutate policy for setting Node metadata in Longhorn context

Summary

Due to current limitations described in #417 (closed) and the particular use-case of configuring Longhorn CSI via K8s (see https://longhorn.io/docs/1.6.0/advanced-resources/default-disk-and-node-config/#customizing-default-disks-for-new-nodes), we would need a way to have cluster nodes annotated. As discussed in #417 (comment 1566487272), Kyberno could provide such means.

related references

Details

Using a Kyverno mutate policy, a nodes's label could be copied in annotation applied to that node.