add stun port to compose file

compose/docker-compose.yml

@@ -27,6 +27,7 @@ services:
       VERBOSITY: "1"
       MQ_PASSWORD: "REPLACE_MQ_PASSWORD"
       MQ_USERNAME: "REPLACE_MQ_USERNAME"
+      STUN_PORT: "3478"
     ports:
       - "3478:3478/udp"
   netmaker-ui: