Extend PKG_CONFIG path rather than setting it by chrhansk · Pull Request #1242 · actions/setup-python

Description:
Extend PKG_CONFIG_PATH rather than overwriting it.

Related issue:
See #1243

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

Note: So far I added a test for pypy, which could be copied to other implementations (?)