add new staging cluster

fleet.yaml

@@ -16,6 +16,21 @@ targetCustomizations:
         pgpassword:
           name: postgresql-auth
           key: password
+  - name: jupyter-staging
+    clusterSelector:
+      matchLabels:
+        name: jupyter-staging
+    helm:
+      values:
+        nodeSelector:
+          worker: "true"
+        database:
+          host: postgresql.database.svc
+        persistence:
+          path: /nfs/database-backups/jupyter-staging
+        pgpassword:
+          name: postgres.postgresql.credentials.postgresql.acid.zalan.do
+          key: password
   - name: jupyterjsc-production
     clusterSelector:
       matchLabels: