nixos/nvidia-container-toolkit: fix tests

[ereslibre]

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• Nixpkgs 25.11 Release Notes (or backporting 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 25.05 NixOS Release notes)
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other contributing documentation in corresponding paths.

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[github-actions]

This report is automatically generated by the check-cherry-picks CI workflow.

Some of the commits in this PR have not been cherry-picked exactly and require the author's and reviewer's attention.

Please make sure to follow the backporting guidelines and cherry-pick with the -x flag. This requires changes to go to the unstable branches (master / staging) first, before backporting them.

Occasionally, it is not possible to cherry-pick exactly the same patch. This most frequently happens when resolving merge conflicts while cherry-picking or when updating minor versions of packages which have already advanced to the next major on unstable. If you need to merge this PR despite the warnings, please dismiss this review.

Caution

8d71caa given in 93e474b not found in any pickable branch.

Hint: The full diffs are also available in the runner logs with slightly better highlighting.

[ConnorBaker]

See #12 (comment)