If the butler download doesn’t work, your binaries are still available under the builds directory. You can manually upload the zip files located in there.
If you only want to package your game you can do ./dragonruby-publish —-package which will only create the zips.
You can find instructions for setting up your Itch game to be web playable here: https://docs.dragonruby.org/#/guides/deploying-to-itch