api: content: pass encrypted status for PBS backups

Prefer the fingerprint, fallback to checking the files crypt-mode.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

PVE/API2/Storage/Content.pm

@@ -92,6 +92,12 @@ __PACKAGE__->register_method ({
 		    type => 'string',
 		    optional => 1,
 		},
+		encrypted => {
+		    description => "If whole backup is encrypted, value is the fingerprint or '1' "
+			." if encrypted. Only useful for the Proxmox Backup Server storage type.",
+		    type => 'string',
+		    optional => 1,
+		},
 		verification => {
 		    description => "Last backup verification result, only useful for PBS storages.",
 		    type => 'object',