Server: Make unix socket permission configurable (#52944)

conf/defaults.ini

@@ -66,6 +66,15 @@ enable_gzip = false
 cert_file =
 cert_key =
 
+# Unix socket gid
+# Changing the gid of a file without privileges requires that the target group is in the group of the process and that the process is the file owner
+# It is recommended to set the gid as http server user gid
+# Not set when the value is -1
+socket_gid = -1
+
+# Unix socket mode
+socket_mode = 0660
+
 # Unix socket path
 socket = /tmp/grafana.sock