Run the wireguard watchdog script every 5 minutes (#1102)

This fixes up wireguard connections to dynamically changing IP addresses

files/usr/local/bin/mgr/wireguard_watchdog.lua

@@ -0,0 +1,52 @@
+
+--[[
+
+	Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
+	Copyright (C) 2024 Tim Wilkinson
+	See Contributors file for additional contributors
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation version 3 of the License.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+	Additional Terms:
+
+	Additional use restrictions exist on the AREDN(TM) trademark and logo.
+		See AREDNLicense.txt for more info.
+
+	Attributions to the AREDN Project must be retained in the source code.
+	If importing this code into a new or existing project attribution
+	to the AREDN project must be added to the source code.
+
+	You must not misrepresent the origin of the material contained within.
+
+	Modified versions must be modified to attribute to the original source
+	and be marked in reasonable ways as differentiate it from the original
+	version
+
+--]]
+
+local wireguard_watchdog_sh = "/usr/bin/wireguard_watchdog"
+
+function wireguard_watchdog()
+    while true
+    do
+        wait_for_ticks(300) -- every 5 minutes
+
+        -- Only run the script if we have wireguard connections
+        local c = uci.cursor()
+        if c:get("network", "wgs0") or c:get("network", "wgc0") then
+            os.execute(wireguard_watchdog_sh)
+        end
+    end
+end
+
+return wireguard_watchdog