I tried setting up Zitadel and couldn't because for whatever reason it's Nix build isn't reproduceable. So Nix always breaks when trying to verify that it, you know, actually built correctly. So I eventually gave up.
[1]: https://search.nixos.org/options?channel=25.05&query=zitadel
[2]: https://git.joshuabell.xyz/ringofstorms/dotfiles/src/branch/...