velero: RFE: support non-PVC pod volumes (e.g. gcePersistentDisk) using block store plugin

Using tag 1.71 for ark. 1.Deployed a stateful app https://cloud.google.com/kubernetes-engine/docs/tutorials/persistent-disk When backed up in the describe section the PV part gives none included ➜ Downloads ark backup create wp-app --selector app=wordpress Backup request “wp-app” submitted successfully. Run ark backup describe wp-app for more details. ➜ Downloads ark backup describe wp-app Name: wp-app Namespace: heptio-ark Labels: <none> Annotations: <none> Namespaces: Included: * Excluded: <none> Resources: Included: * Excluded: <none> Cluster-scoped: auto

Label selector: app=wordpress

Snapshot PVs: auto

TTL: 720h0m0s

Hooks: <none>

Phase: Completed

Backup Format Version: 1

Expiration: 2018-05-02 15:44:03 +0530 IST

Validation errors: <none>

Persistent Volumes: <none included>