vpn: add wireguard watchdog

configs/vpn/etc/uci-defaults/98-wireguard-add-interface.env

@@ -35,4 +35,12 @@ commit network
 add_list firewall.vwan.network=wg
 commit firewall
 EOI
+
+    # setup re-resolve
+    [ -d /etc/crontabs ] || mkdir /etc/crontabs
+    if ! [ -f /etc/crontabs/root ] || ! grep -q wireguard_watchdog /etc/crontabs/root; then
+        echo "* * * * * $(which wireguard_watchdog)" >> /etc/crontabs/root
+        /etc/init.d/cron enable
+        /etc/init.d/cron start
+    fi
 fi