Oh looks like the docs mention Blossom support already, so the answer is anywhere you want. Great! I think it can read from GitHub or other arbitrary internet sources too. @franzap can correct me if I’m wrong. I’m several months out of date on his project.

Yes! With the latest zapstore-cli you can choose any amount of Blossom servers to push your assets to, in addition to the default cdn.zapstore.dev. For Github releases (which will soon be living in a separate relay) the APKs are fetched from Github first, and we keep a copy as backup.