Disable checking the client request body size.

See also http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size

docker/common/nginx/nginx.conf.template

@@ -26,6 +26,7 @@ server {
   location /status {
         proxy_pass $API_URL;
   }
+  client_max_body_size 0;
   gzip_min_length 1000;
   gzip on;
   gzip_http_version 1.0;