* octobercms config allow all xml files in web-root

config/nginx/includes.d/octobercms.conf

@@ -10,7 +10,7 @@
     # Whitelist
     ## Let October handle if static file not exists
     location = /favicon.ico { try_files $uri /index.php; }
-    location = /sitemap.xml { try_files $uri /index.php; }
+    location ~ ^/.*\.xml { try_files $uri /index.php; }
     location = /robots.txt { try_files $uri /index.php; }
     location = /humans.txt { try_files $uri /index.php; }