nix flake prefetch-inputs: Fetching Flake Inputs

1st chunk of `src/nix/flake-prefetch-inputs.md`

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# Examples

* Fetch the inputs of the `hydra` flake:

  ```console
  # nix flake prefetch-inputs github:NixOS/hydra
  ```

# Description

Fetch the inputs of a flake. This ensures that they are already available for any subsequent evaluation of the flake.

This operation is recursive: it will fetch not just the direct inputs of the top-level flake, but also transitive inputs.

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Title: nix flake prefetch-inputs: Fetching Flake Inputs

Summary

The `nix flake prefetch-inputs` command is used to fetch all inputs, including transitive ones, for a specified Nix flake. This action ensures that all necessary flake inputs are pre-downloaded and available for any subsequent evaluation of the flake, speeding up future operations.