bundles/nginx: we need a type definition for .mjs

bundles/nginx/files/nginx.conf

@@ -10,6 +10,9 @@ events {
 
 http {
     include       /etc/nginx/mime.types;
+    types {
+        application/javascript mjs;
+    }
     default_type  application/octet-stream;
     charset UTF-8;
     override_charset on;