Add built-in TURN server.

ice/ice.go

@@ -14,6 +14,8 @@ import (
 	"time"
 
 	"github.com/pion/webrtc/v3"
+
+	"github.com/jech/galene/turnserver"
 )
 
 type Server struct {
@@ -101,6 +103,8 @@ func updateICEConfiguration() *configuration {
 		}
 	}
 
+	cf.ICEServers = append(cf.ICEServers, turnserver.ICEServers()...)
+
 	if ICERelayOnly {
 		cf.ICETransportPolicy = webrtc.ICETransportPolicyRelay
 	}