Make it possible to annotate Prometheus operator CRDs

[AndersBennedsgaard]

I would like to be able to add the helm.sh/resource-policy=keep annotation to all the CRDs coming from the Prometheus operator, to ensure minimal probability of having the CRDs being deleted during operations.
It should be possible to add arbitrary annotations/labels to the CRD

[langecode]

I see your point as the state of Prometheus instances might be lost if removal of CRDs causes Prometheus instances to be removed. However, using the Helm crd management functionality I do not think this is possible. Helm wont do any templating for the resources in the crds folder. If using Flux there is a post processing feature that might be able to handle this.