OS: allow set NTP (#252)

* OS: allow set NTP

* Create etc-systemd-timesyncd.conf.mount

* Update hassos-config

* Update configuration.md

* add link

* Update Documentation/configuration.md

Co-Authored-By: pvizeli <pascal.vizeli@syshack.ch>

buildroot-external/rootfs-overlay/usr/sbin/hassos-config

@@ -75,6 +75,15 @@ else
     systemctl stop dropbear > /dev/null 2>&1
 fi
 
+##
+# timesyncd
+if [ -f "${CONFIG_DIR}/timesyncd.conf" ]; then
+    echo "[Info] Update timesyncd config"
+
+    cat "${CONFIG_DIR}/timesyncd.conf" > /etc/systemd/timesyncd.conf
+    systemctl restart systemd-timesyncd.service > /dev/null 2>&1
+fi
+
 ##
 # Firmware update / Only USB
 UPTIME=$(awk '{printf "%0.f", $1}' /proc/uptime)