Use determinate-specific input names

[heywoodlh]

I watch my flake.lock pretty closely and don't like duplicate inputs. This renames generic inputs to something specific to Determinate -- since Determinate doesn't want users overriding nixpkgs.

Here's a snippet from my flake.nix which removes duplicate inputs:

    # TODO: update to upstream input when PR is merged
    determinate-nixpkgs.url = "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.811874%2Brev-daf6dc47aa4b44791372d6139ab7b25269184d55/019a3494-3498-707e-9086-1fb81badc7fe/source.tar.gz"; 

    determinate-nix = {
      url = "github:heywoodlh/nix-src/fix-input-conflict";
      inputs.determinate-nixpkgs.follows = "determinate-nixpkgs";
      inputs.flake-parts.follows = "flake-parts";
      inputs.git-hooks-nix.follows = "pre-commit-hooks";
    };
    determinate = {
      url = "github:heywoodlh/determinate/fix-input-conflict";
      inputs.determinate-nixpkgs.follows = "determinate-nixpkgs";
      inputs.determinate-nix.follows = "determinate-nix";
    };

Should probably not be merged until the same PR is approved and merged in nix-src.

Summary by CodeRabbit

• Documentation

  • Removed outdated guidance regarding follows directives.

• Chores

  • Updated core project dependencies for improved build consistency and reproducibility.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR replaces the flake's top-level Nix and Nixpkgs inputs with Determinate-managed versions (determinate-nix and determinate-nixpkgs), updates the outputs function signature accordingly, and rewires all internal references to use the new inputs. Documentation is updated to reflect the new pattern.

Changes

Cohort / File(s)	Summary
Documentation README.md	Removed advisory sentence against using follows directive for Nixpkgs with Determinate flake.
Flake Configuration flake.nix	Replaced nix and nixpkgs inputs with determinate-nix and determinate-nixpkgs; updated outputs function signature and all internal references (nixpkgs.lib.genAttrs → determinate-nixpkgs.lib.genAttrs, import source changes).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Improve the overall nix-darwin experience #136: Directly related as it similarly modifies flake inputs/outputs and rewires nixpkgs to determinate-nixpkgs with corresponding function signature and import updates.

Suggested reviewers

• colemickels

Poem

🐰 A determined path, so clear and bright,
Inputs rewired with Determinate might,
No more nixpkgs, determinate's the way,
Flakes flow smoother, hooray, hooray! ✨

🚥 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 clearly summarizes the main change: renaming generic flake inputs to determinate-specific names, which is exactly what the changeset accomplishes across flake.nix and documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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