feat(nix): Implement nix-build-check hook

[aRustyDev]

Description

Implement a pre-commit hook to test Nix builds for both legacy and flake-based projects.

Requirements

• Support both default.nix and flake-based builds
• Check for successful evaluation and build
• Support building specific attributes via args
• Provide option for dry-run builds
• Clear error reporting for build failures

Implementation Details

• Location: hooks/nix/nix-build-check.sh
• Language: bash script
• File patterns: *.nix, default.nix, shell.nix

Testing

• Test with simple derivation
• Test with complex multi-output derivation
• Test with both flakes and legacy nix
• Test with build failures
• Test with evaluation errors

Configuration in .pre-commit-hooks.yaml

- id: nix-build-check
  name: Check Nix builds
  description: Tests that Nix expressions build successfully
  entry: hooks/nix/nix-build-check.sh
  language: script
  files: (default|shell)\.nix$
  pass_filenames: true