jvb: add ability to disable STUN

Fixes: https://github.com/jitsi/docker-jitsi-meet/issues/1321

docker-compose.yml

@@ -291,6 +291,7 @@ services:
             - JVB_AUTH_USER
             - JVB_AUTH_PASSWORD
             - JVB_BREWERY_MUC
+            - JVB_DISABLE_STUN
             - JVB_PORT
             - JVB_MUC_NICKNAME
             - JVB_STUN_SERVERS

jvb/rootfs/defaults/jvb.conf

@@ -1,6 +1,7 @@
 {{ $COLIBRI_REST_ENABLED := .Env.COLIBRI_REST_ENABLED | default "false" | toBool }}
 {{ $ENABLE_COLIBRI_WEBSOCKET := .Env.ENABLE_COLIBRI_WEBSOCKET | default "1" | toBool }}
 {{ $ENABLE_OCTO := .Env.ENABLE_OCTO | default "0" | toBool }}
+{{ $JVB_DISABLE_STUN := .Env.JVB_DISABLE_STUN- | default "0" | toBool }}
 {{ $JVB_STUN_SERVERS := .Env.JVB_STUN_SERVERS | default "meet-jit-si-turnrelay.jitsi.net:443" -}}
 {{ $JVB_AUTH_USER := .Env.JVB_AUTH_USER | default "jvb" -}}
 {{ $JVB_BREWERY_MUC := .Env.JVB_BREWERY_MUC | default "jvbbrewery" -}}
@@ -84,7 +85,7 @@ ice4j {
     harvest {
         mapping {
             stun {
-{{ if $JVB_STUN_SERVERS -}}
+{{ if not $JVB_DISABLE_STUN -}}
                 addresses = [ "{{ join "\",\"" (splitList "," $JVB_STUN_SERVERS) }}" ]
 {{ else -}}
                 enabled = false