test driver: normalize callpackage call

[tfc]

This PR puts the test driver package function into package normal form to facilitate easier override of the python version of everything.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[roberth]

I'm not much of a python maintainer, but no special concerns from me as someone who has worked a bit nixos/lib/testing.

Something we probably should take into account is infra has set up a staging-nixos branch for these kinds of rebuilds. Could you target that branch?

[tfc]

Something we probably should take into account is infra has set up a staging-nixos branch for these kinds of rebuilds. Could you target that branch?

done

All good now, thank you!

[tfc]

@roberth hmmm i don't understand the CI error. it says the PR contains commits of a different base, although i literally rebased onto the latest staging-nixos before i switched the PR base.

oh nvm it looks like that was from some inbetween state.