Add expected labels on postgresql pods

Author: vprivat-ads

apps/01-cloudnative-pg/cluster.yaml

@@ -16,6 +16,8 @@ apiVersion: postgresql.cnpg.io/v1
 kind: Cluster
 metadata:
   name: postgresql-cluster
+  labels:
+    app.kubernetes.io/instance: '{{ app_name }}'
 spec:
   instances: 3