PR #50 removed the four `x86_64-v2` variant entries to reclaim compute
on the build server. The entries can be restored without changing what
garnix builds, because the current `garnix.yaml` `builds.include` list
only enumerates the four baseline variants (`linux-cachyos-{latest,
latest-lto,lts,lts-lto}`) — v2 stays excluded from garnix either way.
The infrastructure to build v2 (mkCachyKernel accepting `processorOpt
= "x86_64-v2"`, cachySettings.nix retaining the full v2 config block,
CachyOS upstream kconfig support) is intact; PR #50 only removed the
attrset entries. This restores them so downstream Nix users on
v2-only hardware can keep using `pkgs.cachyosKernels.linux-cachyos-*-
x86_64-v2` (built locally) instead of vendoring mkCachyKernel.
Restores:
- linux-cachyos-latest-x86_64-v2
- linux-cachyos-latest-lto-x86_64-v2
- linux-cachyos-lts-x86_64-v2
- linux-cachyos-lts-lto-x86_64-v2
No changes to garnix.yaml, mkCachyKernel.nix, helpers.nix, or
cachySettings.nix.
