allow setting env vars in test section

[jschueller]

Checklist

• [X] I added a descriptive title
• [X] I searched open requests and couldn't find a duplicate

What is the idea?

similarly to the build section

build:
  script_env:
    - MYVAR
    - ANOTHER_VAR

we could need to set env vars in the test section

Why is this needed?

for example see how it would help this one: https://github.com/conda-forge/scikit-image-feedstock/blob/main/recipe/meta.yaml#L130

test:
  requires:
    - pytest
    - pytest-localserver
    # Include pooch to ensure full test coverage
    - pooch  # [not (ppc64le or aarch64)]
    - pip
  imports:
    - skimage
  commands:
    # 2023/06/28 -- Seems like pypy + scipy's pip check is broken
    - pip check              # [python_impl == 'cpython']
    - setx MPLBACKEND "Agg"  # [win]
    - export MPLBACKEND=Agg  # [unix]

What should happen?

No response

Additional Context

No response

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Thanks!

[jschueller]

no one ?