Add backupSet labels to wekan's mongodb

flux2/apps/wekan/wekan-values-configmap.yaml

@@ -95,11 +95,15 @@ data:
         rootPassword: ${mongodb_root_password}
         password: ${mongodb_password}
       podAnnotations:
-        # Let the backup system include rocketchat data stored in mongodb.
+        # Let the backup system include wekan data stored in mongodb.
         backup.velero.io/backup-volumes: "datadir"
+      podLabels:
+        openappstack.net/backupSet: "wekan"
+      # `labels` are applied by the mongodb chart to the statefulset.
+      labels:
+        openappstack.net/backupSet: "wekan"
       persistence:
         enabled: true
-        # FIXME: This value is ignored by the chart currently in use
         existingClaim: "wekan"
       resources:
         limits: