fix: capability doesn't provide a secret, we get the kubedb generated…

… one

This change is needed due to a change of behavior of the capability which
requires a secret name to be set in order to generate one.

demo/fruit-backend-sb/src/main/resources/application.yml

@@ -11,7 +11,7 @@ dekorate:
     name: link-to-database
     componentName: fruit-backend-sb
     type: Secret
-    ref: postgres-db-config
+    ref: postgres-db-auth
   capability:
     name: postgres-db
     category: database