Add note on Skylight and S3

content/articles/2025-08-10-ctlog-2.md

@@ -629,6 +629,10 @@ current write-load (which is about 250/s).
      precaution - but also using ports in those prefixes (other than the standard 443) rendered
      Sunlight and Skylight unusable for me.
 
+*    Skylight only serves from local directory, it does not have support for S3. For operators using S3,
+     an alternative could be to use NGINX in the serving path, similar to TesseraCT. Skylight does have
+     a few things to teach me though, notably on proper compression, content type and other headers.
+
 *    TesseraCT does not have a configuration file, and will run exactly one log per binary
      instance. It uses flags to construct the environment, and is much more forgiving for creative
      `origin` (log name), and submission- and monitoring URLs. It's happy to use regular 'http://'