fix installer bugs & improve (#341)

* fix installer bugs && improve

* Update install_en.sh

script/nezha-dashboard

@@ -1,4 +1,8 @@
 #!/sbin/openrc-run
+supervisor=supervise-daemon
+name=nezha-dashboard
+output_log=/var/log/${name}.log
+error_log=/var/log/${name}.err
 pidfile="/run/${RC_SVCNAME}.pid"
 command="/opt/nezha/dashboard/app"
 command_args=""
@@ -6,11 +10,9 @@ command_background=true
 directory="/opt/nezha/dashboard"
 
 depend() {
-	need net
+	  need net
 }
 
-reload() {
-  ebegin "Reloading ${RC_SVCNAME}"
-  start-stop-daemon --signal HUP --pidfile "${pidfile}"
-  eend $?
+start_pre() {
+    checkpath -f -m 0644 -o root:root "/var/log/${name}.log"
 }