build: Nix instead Flox

[vorburger]

Relates to #1231.

[gemini-code-assist]

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request replaces Flox with Nix for environment management. It introduces a flake.nix and flake.lock file for Nix, removes Flox-related files like the environment manifest, and updates .gitignore and .envrc accordingly. The PR also relates to issue #1231.

Highlights

• Environment Management: The pull request migrates the project from Flox to Nix for managing the development environment.
• Nix Flake Introduction: It introduces flake.nix and flake.lock files, defining the Nix environment and its dependencies.
• Flox Removal: The pull request removes files associated with Flox, such as the environment manifest, indicating a complete switch to Nix.
• .envrc Update: The .envrc file is updated to use the Nix flake, ensuring the environment is set up correctly when entering the project directory.
• .gitignore Update: The .gitignore file is updated to ignore Nix-related files and directories, preventing them from being committed to the repository.

Changelog

Click here to see the changelog

• .envrc
  • Added use flake to enable Nix flake integration.
  • Added source_env_if_exists .envrc.local to allow for local environment customizations.
• .gitignore
  • Added .direnv/ to ignore the direnv directory, likely used in conjunction with Nix.
• Removed files
  • Removed the old environment manifest file previously used by Flox.
  • Removed run/, cache/, lib/, log/ and !env/ from the root directory.
  • Removed the package.json file.
• flake.lock
  • Introduced the flake.lock file to lock the versions of the Nix flake dependencies.
• flake.nix
  • Introduced the flake.nix file to define the Nix flake, including inputs for flake-schemas and nixpkgs.
  • Configured a development shell with pinned packages like python311, pip, virtualenv, curl, git, bazel, shellcheck, mkdocs, python311Packages.pre-commit-hooks, and nixpkgs-fmt.
  • Added a shellHook that prints a welcome message when entering the environment.

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From Flox's realm, a shift to Nix,
A flake's embrace, a clever fix.
Environments now defined,
Dependencies aligned,
A build so clean, it surely clicks.

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[gemini-code-assist]

Code Review

This pull request introduces Nix as a build system, replacing Flox. The changes include adding Nix-related files and removing Flox-related files. Overall, the changes seem reasonable, but there are a few points that need attention.

Summary of Findings

• .gitignore entry for .direnv/: The addition of .direnv/ to .gitignore is good practice, but the associated TODO comment should be addressed or removed if no longer relevant.
• Removal of Flox-related files: The removal of files like flox.lock and the Flox manifest should be verified to ensure a complete transition to Nix and that no residual dependencies or configurations are left behind.
• .envrc: The .envrc file introduces use flake, which is a good practice for Nix-based projects. Ensure that this is the intended and correct way to integrate with direnv.

Merge Readiness

The pull request seems to be a significant step towards migrating the build system to Nix. However, the TODO comment in .gitignore should be addressed, and the complete removal of Flox dependencies should be verified before merging. I am unable to approve this pull request, and recommend that others review and approve this code before merging.