Persistent Storage for Registry

[mirza-src]

Currently there is no way to persist registry data. This should be configurable as a volume mount in for the Registry resource

[glennpratt]

For me, I didn't need local persistent storage, but remote. I needed to clear the default storage configuration or registry would error on start, which wasn't obvious:

apiVersion: ctlptl.dev/v1alpha1
kind: Registry
env:
  - REGISTRY_STORAGE={}
  - REGISTRY_STORAGE_S3_BUCKET=my-bucket
  - REGISTRY_STORAGE_S3_ACCESSKEY=FAKE
...