chore: add example systemd service unit

Author: marjune163

conf/systemd/etc/ghfs.conf

@@ -0,0 +1,4 @@
+--root /data
+--hide lost+found
+--access-log /var/log/ghfs/access.log
+--error-log /var/log/ghfs/error.log

conf/systemd/etc/systemd/system/ghfs.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Go http file server
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/ghfs --config=/etc/ghfs.conf
+ExecReload=/bin/kill -s HUP $MAINPID
+KillSignal=SIGTERM
+KillMode=process
+
+[Install]
+WantedBy=multi-user.target

conf/systemd/etc/systemd/system/ghfs@.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Go http file server
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/ghfs --config=/etc/ghfs_%I.conf
+ExecReload=/bin/kill -s HUP $MAINPID
+KillSignal=SIGTERM
+KillMode=process
+
+[Install]
+WantedBy=multi-user.target