add server name to valet.conf (#1458)

* add server name to valet.conf

* Cosmetic change

* Cosmetic change

* change server_name `valet` to `"!valet!" ""`

---------

Co-authored-by: Bahar Oleg <[email protected]>

Author: Oleg339

cli/stubs/valet.conf

@@ -1,6 +1,7 @@
 server {
     listen 127.0.0.1:80 default_server;
     #listen VALET_LOOPBACK:80; # valet loopback
+    server_name "!valet!" "";
     root /;
     charset utf-8;
     client_max_body_size 128M;