feat(flake): substituters

[Malix-Labs]

Feature native substituters suggestion / hint to flake.nix

This will also be shown in flake.nix importing this flake

References

• https://docs.determinate.systems/guides/advanced-installation
• https://wiki.nixos.org/wiki/Flakes#Nix_configuration

Summary by CodeRabbit

• Chores
  • Updated build system configuration with additional package substitution sources and trusted signing keys.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b083300 and f4f6749.

📒 Files selected for processing (1)

• flake.nix

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📝 Walkthrough

Walkthrough

This change introduces a new nixConfig attribute at the top level of flake.nix, configuring additional Nix package substituters and their corresponding trusted public keys. The addition enables the flake to use Determinate Systems' cache infrastructure without modifying any existing logic.

Changes

Cohort / File(s)	Summary
Nix Configuration flake.nix	Adds top-level nixConfig attribute with extra-substituters pointing to Determinate Systems cache and corresponding extra-trusted-public-keys entry for cache verification.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A cache we hop toward, swift and true,
Determinate systems in our flake's view,
Keys trusted, substituters aligned,
Faster builds and peace of mind!
Nix flourishes with trusty ground,
Where caches and configs abound! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(flake): substituters' directly relates to the main change: adding nixConfig with substituters (extra-substituters and extra-trusted-public-keys) to flake.nix.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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