Add SystemD service file to Linux installation

OpenRGB.pro

@@ -577,7 +577,9 @@ contains(QMAKE_PLATFORM, linux) {
     icon.files+=qt/org.openrgb.OpenRGB.png
     metainfo.path=$$PREFIX/share/metainfo/
     metainfo.files+=qt/org.openrgb.OpenRGB.metainfo.xml
-    INSTALLS += target desktop icon metainfo udev_rules
+    systemd_service.path=/etc/systemd/system
+    systemd_service.files+=qt/openrgb.service
+    INSTALLS += target desktop icon metainfo udev_rules systemd_service
 }
 
 #-----------------------------------------------------------------------------------------------#

qt/openrgb.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=OpenRGB SDK Server
+After=network.target lm_sensors.service
+
+[Service]
+RemainAfterExit=yes
+ExecStart=/usr/bin/openrgb --server
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
+