Add additional proxy headers to nginx config

This is required to have better log output.

roles/nginx/templates/nginx-server.j2

@@ -15,5 +15,10 @@ server {
 
   location / {
     proxy_pass http://127.0.0.1:{{ site_port }};
+
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
   }
 }