fix: do not take python variant when noarch:python

[nichmor]

When having noarch: python in recipe

requirements:
  host:

    - python
    - pip
    - setuptools
  run:
    - pip

and also variants.yaml

python:
  # part of a zip_keys: python, python_impl, numpy
  - 3.8.* *_cpython
  - 3.9.* *_cpython

python_impl:
  # part of a zip_keys: python, python_impl, numpy
  - cpython
  - cpython
numpy:
  # part of a zip_keys: python, python_impl, numpy
  - 1.22
  - 1.22

rattler-build should render only one recipe and don't take into account python variants ( like how conda render do )

[wolfv]

Cool! Can you add a test of some sort? Even if it's just a snapshot test of the rendering or something like that.

I think the variant_config.rs file deserves to be refactored some day but I am OK with merging this for now :)

[nichmor]

Cool! Can you add a test of some sort? Even if it's just a snapshot test of the rendering or something like that.

I think the variant_config.rs file deserves to be refactored some day but I am OK with merging this for now :)

sure - I've added the test for it