docker-compose.yml: add WG_PERSISTENT_KEEPALIVE

docker-compose.yml

@@ -16,6 +16,7 @@ services:
       # - WG_DEFAULT_DNS=1.1.1.1
       # - WG_MTU=1420
       # - WG_ALLOWED_IPS=192.168.15.0/24, 10.0.1.0/24
+      # - WG_PERSISTENT_KEEPALIVE=25
       # - WG_PRE_UP=echo "Pre Up" > /etc/wireguard/pre-up.txt
       # - WG_POST_UP=echo "Post Up" > /etc/wireguard/post-up.txt
       # - WG_PRE_DOWN=echo "Pre Down" > /etc/wireguard/pre-down.txt