add gzip/brotli configuration for future use

nginx/nginx.conf

@@ -67,6 +67,9 @@ http {
     error_log /var/log/nginx/error.log;
     log_not_found off;
 
+    gzip_proxied any;
+    gzip_vary on;
+
     if_modified_since before;
 
     aio threads;