Add YT_POT_BGUTIL_BASE_URL environment variable

config/root/etc/nginx/nginx.conf

@@ -5,6 +5,8 @@ worker_processes auto;
 worker_cpu_affinity auto;
 pid /run/nginx.pid;
 
+env YT_POT_BGUTIL_BASE_URL;
+
 events {
     worker_connections 1024;
 }