Mlugg is looking to take his "mirror list" he put together for the setup-zig action and make it reusable for other tools like zigup/anyzig. If/when this happens I'd like to add support for downloading from these mirrors. We discussed that the list of mirrors would likely be a JSON file hosted either on github or possibly ziglang.org. His approach in setup-zig is to shuffle the list try each mirror one-by-one until it works.

I expect zigup/anyzig will want to keep some metadata about the various mirrors and can do so in the appdata directory where we already store some metadata about the system/environment.

Also note it might make sense to provide a "mirror-test" command to check the performance of each mirror and possibly some configuration options. Maybe allow the user to set mirror priorities or possibly add custom mirrors?