Registry support for htpasswd

[iainsproat]

Hi, I'd like to deploy the docker registry with basic/htpasswd protection.

I'm able to add the relevant env values (see below), but I'm not sure if there's an existing supported way to configure ctlptl to mount a volume containing the htpasswd (to /auth/htpasswd)?

apiVersion: ctlptl.dev/v1alpha1
kind: Registry
name: ctlptl-registry
port: 5000
listenAddress: 127.0.0.1
env:
  - REGISTRY_AUTH=htpasswd
  - REGISTRY_AUTH_HTPASSWD_PATH=/auth/htpasswd
  - REGISTRY_AUTH_HTPASSWD_REALM="Registry Realm"