Added port forward only for VPNs that support it

docker-compose.custom.yaml

@@ -1,4 +1,2 @@
-version: "3"
-
 # services:
   # Add your custom services here!

docker-compose.example.yaml

@@ -165,6 +165,7 @@ services:
       - OPENVPN_USER=${VPN_USER}
       - OPENVPN_PASSWORD=${VPN_PASSWORD}
       - OPENVPN_CIPHERS=AES-256-GCM
+      - PORT_FORWARD_ONLY=on
     restart: unless-stopped
 
   # Portainer helps debugging and monitors the containers