compose: add jvb dependency to web container (#1739)

since web runs dig jvb on startup, if jvb isn't up yet, this can fail or point to a wrong ip, leading the colibri websocket connection to fail

docker-compose.yml

@@ -174,6 +174,8 @@ services:
             - WHITEBOARD_COLLAB_SERVER_PUBLIC_URL
         networks:
             meet.jitsi:
+        depends_on:
+            - jvb
 
     # XMPP server
     prosody: