Nix NAR Pack Command

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# Examples

* To serialise directory `foo` as a [Nix Archive (NAR)][Nix Archive]:

  ```console
  # nix nar pack ./foo > foo.nar
  ```

# Description

This command generates a [Nix Archive (NAR)][Nix Archive] file containing the serialisation of
*path*, which must contain only regular files, directories and
symbolic links. The NAR is written to standard output.


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Title: Nix NAR Pack Command

Summary

The `nix nar pack` command creates a Nix Archive (NAR) file from a given path, which can contain regular files, directories, and symbolic links. The resulting NAR file is written to standard output. An example usage is provided, demonstrating how to serialize a directory named 'foo' into a NAR file named 'foo.nar'.