add install and uninstall targets for systemctl

Makefile

@@ -1,4 +1,4 @@
-.PHONY: build run clean
+.PHONY: build run clean install uninstall
 
 include openwrt.conf
 
@@ -11,4 +11,18 @@ run:
 clean:
 		docker rm ${CONTAINER} || true
 		docker network rm ${LAN_NAME} ${WAN_NAME} || true
-		docker rmi ${BUILD_TAG}
+		docker rmi ${BUILD_TAG}
+
+install:
+	install -Dm644 openwrt.service /usr/lib/systemd/system/openwrt.service
+	sed -i -E "s#(ExecStart=).*#\1`pwd`/run.sh#g" /usr/lib/systemd/system/openwrt.service
+	systemctl daemon-reload
+	systemctl enable openwrt.service
+	@echo "OpenWRT service installed and will be started on next boot automatically."
+	@echo "To start it now, run 'systemctl start openwrt.service'."
+
+uninstall:
+	systemctl stop openwrt.service
+	systemctl disable openwrt.service
+	rm /usr/lib/systemd/system/openwrt.service
+	systemctl daemon-reload

openwrt.service

@@ -0,0 +1,9 @@
+[Unit]
+Description="OpenWRT"
+
+[Service]
+Type=simple
+ExecStart=
+
+[Install]
+WantedBy=network-online.target