cloudnative_pg: wait for webhook (#1306)

This will avoid the following issue when running the keycloak role after
the cloudnative_pg role.

no endpoints available for service "cnpg-webhook-service"

Signed-off-by: Christian Berendt <berendt@osism.tech>

roles/cloudnative_pg/tasks/main.yml

@@ -5,3 +5,4 @@
     chart_ref: cnpg/cloudnative-pg
     release_namespace: cnpg-system
     create_namespace: true
+    wait: true