Tested if the resolver directive fixes not being able to resolve `k…

…lokantech.github.io`

data/nginx.conf

@@ -47,6 +47,7 @@ http {
     }
 
     location ~ ^/cdn/natural_earth_2_shaded_relief.raster/(.+)$ {
+      resolver 1.1.1.1;
       proxy_pass https://klokantech.github.io/naturalearthtiles/tiles/natural_earth_2_shaded_relief.raster/$1;
       proxy_set_header Host $proxy_host;
     }