Make test.sh executable

Fixes failing pipeline job.

Author: ansd

docs/examples/set-login-password-username/test.sh

@@ -1,4 +1,5 @@
+#!/bin/bash
 
 set -ex
 
-kubectl exec -it myrabbitmq-server-0 -c rabbitmq -- rabbitmqctl authenticate_user guest guest
+kubectl exec myrabbitmq-server-0 -c rabbitmq -- rabbitmqctl authenticate_user guest guest