GitLab

we already have a free development shell based on the `packages` output,
there is no reason to replicate it here.

Flake lock file updates:

• Added input 'flake-compat':
    'github:edolstra/flake-compat/64a525ee38886ab9028e6f61790de0832aa3ef03' (2022-03-25)
• Updated input 'flake-utils':
    'github:numtide/flake-utils/3cecb5b042f7f209c56ffd8371b2711a290ec797' (2022-02-07)
  → 'github:numtide/flake-utils/0f8662f1319ad6abf89b3380dd2722369fc51ade' (2022-03-26)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/73ad5f9e147c0d2a2061f1d4bd91e05078dc0b58' (2022-03-14)
  → 'github:nixos/nixpkgs/1d08ea2bd83abef174fb43cbfb8a856b8ef2ce26' (2022-03-23)

they are a byproduct of building the package locally

we literally want to print '$pkgname' to the user, so ignore the error

It is POSIX[1] so no reason to not assume it, plus busybox implements
it, and it is more readable

[1]: https://pubs.opengroup.org/onlinepubs/009695399/utilities/grep.html