Chore: add udp-timeout option to docker image

Dockerfile

@@ -23,6 +23,7 @@ ENV PROXY=direct://
 ENV MTU=9000
 ENV STATS=
 ENV TOKEN=
+ENV UDP_TIMEOUT=
 ENV EXTRA_COMMANDS=
 ENV TUN_INCLUDED_ROUTES=
 ENV TUN_EXCLUDED_ROUTES=

docker/entrypoint.sh

@@ -69,6 +69,10 @@ main() {
     ARGS="$ARGS -token $TOKEN"
   fi
 
+  if [ -n "$UDP_TIMEOUT" ]; then
+    ARGS="$ARGS -udp-timeout $UDP_TIMEOUT"
+  fi
+
   exec tun2socks \
     -loglevel "$LOGLEVEL" \
     -fwmark "$FWMARK" \