Add settings to allow CNPG Backup and Restore with volume snapshots:
https://github.com/DataONEorg/k8s-cluster/blob/main/operators/postgres/postgres.md#database-backups

To add:

• spec.backup.volumeSnapshot.className, which identifies the VolumeSnapshotClass to be used to make backups
  • Feature-1: Add backup Template #2 -- thank you, @doulikecookiedough!)
• An optional ScheduledBackup to create a Backup on a cron schedule
• spec.bootstrap.recovery section for recovering from a backup