message: set the k8s.servicename to match the SERVICE_NAME.
diff: # clustering uses full hostnames, generate those
  echo NODENAME=rabbit@${HOSTNAME}.${SERVICE_NAME}.${POD_NAMESPACE}.svc.cluster.local > /etc/rabbitmq/rabbitmq-env.conf
  echo cluster_formation.k8s.hostname_suffix=.${SERVICE_NAME}.${POD_NAMESPACE}.svc.cluster.local >> /etc/rabbitmq/rabbitmq.conf
  +echo cluster_formation.k8s.service_name=${SERVICE_NAME} >> /etc/rabbitmq/rabbitmq.conf
  # start the server
  docker-entrypoint.sh rabbitmq-server
  