api: Set GWMAIL_STAGING_BRANCH env

Use the staging API instead of production API.

Signed-off-by: Ammar Faizi <[email protected]>

Author: ammarfaizi2

public/api.php

@@ -1,5 +1,6 @@
 <?php
 
+putenv("GWMAIL_STAGING_BRANCH=1");
 chdir(__DIR__."/../../mail.gnuweeb.org/public/");
 require "api.php";