Setup/nixos enviroment

[MarioYellowy]

Summary by CodeRabbit

• Chores
  • Added a reproducible development environment with Rust tooling and common build utilities.
  • Added support for automatically loading the development environment.
  • Excluded local environment files from version control.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dc16340d-7b0a-4007-a508-6be63f888130

📥 Commits

Reviewing files that changed from the base of the PR and between 3f14912 and 742816c.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• .envrc
• .gitignore
• flake.nix

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📝 Walkthrough

Walkthrough

Adds a Nix flake with a reproducible Rust development shell, configures compiler and Rust source environment variables, and enables automatic loading through direnv while ignoring generated .direnv state.

Changes

Nix development environment

Layer / File(s)	Summary
Define the Rust development shell flake.nix	Adds flake inputs and per-system outputs, configures a stable Rust toolchain with development tools, exposes devShells.default, and sets OpenSSL, Clang, bindgen, and Rust source paths.
Enable automatic shell loading .envrc, .gitignore	Configures direnv to use the flake and ignores the generated .direnv/ directory.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: setting up a Nix-based development environment.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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