Nix packaging & dev environment

[yusdacra]

Packages indielogin and the pgp verify API server, adds a command that can be ran to get a local working indielogin setup for development (can also be used in prod in theory if you don't mind running a separate mysql / redis etc.) all in Nix.

(local setup TUI)

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• PHP 8.2 support #114 is required for any of this to work, so that'd need to be merged before,
• had to update the lockfile for the pgp server, so i'm, not quite sure if that still works as i didn't test it

(this doesn't have to be merged here as i could just make a separate repository to host the nix code if it's deemed too big of a burden (which it most likely is as i don't believe there would be many people using it in the first place lol))

todos:

• see if frontend works on local setup
• check if email auth works on local setup (i'm not actually sure how to test this one 😅)
• check if twitter auth works on local setup
• check if github auth works on local setup
• add a nixos module for actual prod usage