Solution to issue cannot be found in the documentation.
Issue
I used noarch: ${{ "python" if use_noarch }} in conda-forge/coverage-feedstock#154
Allowing empty value for noarch is a feature that was added in rattler-build 0.50.0: prefix-dev/rattler-build#1973
The linter currently complains with: Invalid noarch value ${{ "python" if use_noarch }}. Should be one of python, generic.. It should allow conditional with empty values.
Installed packages
Environment info