Add network capabilities and install iptables in Docker setup

Dockerfile

@@ -4,6 +4,7 @@ FROM dart:3.9.0-100.2.beta
 RUN apt-get update && apt-get install -y \
     wireguard-tools \
     iproute2 \
+    iptables \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app

docker-compose.yml

@@ -14,4 +14,8 @@ services:
       - "51820:51820/udp"
     volumes:
       - /var/run/wireguard:/var/run/wireguard
+    cap_add:
+      - NET_ADMIN
+    devices:
+      - /dev/net/tun
     restart: unless-stopped