add gitea runner

gitea_runner/gitea_runner.service.template

@@ -0,0 +1,14 @@
+[Unit]
+Description=Gitea Actions runner
+Documentation=https://gitea.com/gitea/act_runner
+
+[Service]
+ExecStart=
+ExecReload=/bin/kill -s HUP $MAINPID
+WorkingDirectory=
+TimeoutSec=0
+RestartSec=10
+Restart=always
+
+[Install]
+WantedBy=default.target