Chart: postgresql.existingClaim for a database volume made outside the chart

charts/archify-sync/values.yaml

@@ -31,6 +31,9 @@ postgresql:
   existingSecret: ""
   storage: 5Gi
   storageClass: ""
+  # A PersistentVolumeClaim made outside the chart (e.g. a static NFS volume whose
+  # directory is owned by uid 70, mode 0700); storage and storageClass are then unused.
+  existingClaim: ""
   resources: {}
 
 config: