Can't properly set `LOCALE_ARCHIVE`

[mole99]

Describe the bug

On my system, I have de_AT.UTF-8 set as my locale. Whenever I start a devshell, I get the following warnings:

bash: warning: setlocale: LC_CTYPE: cannot change locale (de_AT.UTF-8): No such file or directory
bash: warning: setlocale: LC_CTYPE: cannot change locale (de_AT.UTF-8): No such file or directory
bash: warning: setlocale: LC_COLLATE: cannot change locale (de_AT.UTF-8): No such file or directory
bash: warning: setlocale: LC_CTYPE: cannot change locale (de_AT.UTF-8): No such file or directory
bash: warning: setlocale: LC_CTYPE: cannot change locale (de_AT.UTF-8): No such file or directory
bash: warning: setlocale: LC_COLLATE: cannot change locale (de_AT.UTF-8): No such file or directory

To get rid of these warnings, I need to set LOCALE_ARCHIVE to "${pkgs.glibcLocales}/lib/locale/locale-archive".
This works just fine in pkgs.mkShell using:

LOCALE_ARCHIVE = lib.optionalString pkgs.stdenv.isLinux "${pkgs.glibcLocales}/lib/locale/locale-archive";

Unfortunately, when trying to do the same in devshell.mkShell using env:

  env = [
    {
      name = "NIX_PYTHONPATH";
      value = "${librelane-env-sitepackages}";
    }
  ]
  ++ lib.optionals stdenv.hostPlatform.isLinux [{
    name = "LOCALE_ARCHIVE";
    value = "${glibcLocales}/lib/locale/locale-archive";
  }]

I still get these warnings, even though LOCALE_ARCHIVE has been set correctly:

$ echo $LOCALE_ARCHIVE
/nix/store/hjlkypp9lpxwzsjycpy7nqg2mnl7qhzv-glibc-locales-2.40-66/lib/locale/locale-archive

The reason is that LOCALE_ARCHIVE is set too late, after which the warnings have already been printed.
When I export LOCALE_ARCHIVE to the correct path before invoking the devshell, the warnings are resolved.

To Reproduce

Steps to reproduce the behavior:

Set your locale to de_AT.UTF-8.

Expected behavior

No warnings should be printed.

System information

Linux

• system: "x86_64-linux"
• host os: Linux 6.12.95+deb13-amd64, Debian GNU/Linux, 13 (trixie), nobuild
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.31.0
• nixpkgs: /nix/store/w0d0sydj6sbcyp1l36ya9wbjh0j56c3j-source

Additional context

None