Collection Upload Options: adminThumbnail to return a promise

[smoglica]

It would be nice to add an additional return type of adminThumbnail function. The return type that I meant is Promise<string>.

Why?

I use Thumbor as image service. In order to be able to create a safe URL for avoiding URL Tampering I need to use crypto (with node 20) object for generating a HMAC SHA1 security key. Methods crypto.subtle.importKey and crypto.subtle.sign are async, so I need to await and then the desired function is async.

I immagine something like this:

adminThumbnail: async ({ doc }) => {
  const url = await buildThumborUrl(doc.filename).size(450).url();

  return url;
}