Way to choose python architecture?

[saschanaz]

What's the problem this feature will solve?

I have arm64 python and x86-64 python, and I want to run tests on arm64 one. I see no way to explicitly select either one.

Describe the solution you'd like

I'm fixing https://github.com/pypa/setuptools/issues/4553 but tox can't select arm64 python. Something like -e py312-arm64 would help.

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Additional context