Add module all-formats.nix

[DavHau]

Motivation:

• allow all formats to be included at once
• test all formats in CI
• no need for custom nixos-generators CLI
• no need for custom nixos-generate nix function
• just include a single module -> profit
• test this pattern here first then contribute to nixpkgs

Done:

• add module all-formats.nix exposing all formats within the current config under system.formats.<format>
• adds a flake check to evaluate and build all formats for x86_64-linux and aarch64-linux
• move some broken formats to ./formats-broken to fix later

Considerations:

• expose formats under system.build instead of system.formats ?
• expose formats as submodule options, so they can be modified on the fly without having to edit the format file

[DavHau]

Now nix flake check goes OOM as it tries to evaluate all formats in a single session.
@Lassulus could we switch the project to hercules or garnix?

[Lassulus]

Now nix flake check goes OOM as it tries to evaluate all formats in a single session. @Lassulus could we switch the project to hercules or garnix?

uh, can we maybe do the checks a way so we don't need to run a big machine to test it? :D

[DavHau]

Sure we can.

We don't necessarily need a big machine. It's just that a single nix eval goes OOM, as it doesn't garbage collect anything.
We could use nix-eval-jobs instead and use one process per attribute. That would make it faster as well potentially.

But why not just enable hercules? It's already available in the org and scales better.

[Lassulus]

ok, lets enable hercules and think later about lowering CI requirements