chore: keep ssl server name in nginx authentik auth route

nginx/nginx.conf

@@ -33,6 +33,7 @@ server {
         proxy_pass              https://auth.staging.graphpolaris.com/outpost.goauthentik.io;
         # ensure the host of this vserver matches your external URL you've configured
         # in authentik
+        proxy_ssl_server_name   on;
         proxy_set_header        Host $host;
         proxy_set_header        X-Original-URL $scheme://$http_host$request_uri;
         add_header              Set-Cookie $auth_cookie;