add gateway to interface configuration

automated install/basic-install.sh

@@ -359,6 +359,7 @@ setStaticIPv4() {
 			$SUDO echo "ONBOOT=yes" >> $IFCFG_FILE
 			$SUDO echo "IPADDR=$IPADDR" >> $IFCFG_FILE
 			$SUDO echo "PREFIX=$CIDR" >> $IFCFG_FILE
+			$SUDO echo "GATEWAY=$IPv4gw" >> $IFCFG_FILE
 			$SUDO echo "USERCTL=no" >> $IFCFG_FILE
 			$SUDO ip addr replace dev "$piholeInterface" "$IPv4addr"
 			if [ -x "$(command -v nmcli)" ];then