Upload fails on OS X with "Container action is only supported on Linux"

[jlaine]

I have successfully used this action to publish source packages and Linux wheels. However when trying to upload wheels from OS X the build fails with:

Run pypa/gh-action-pypi-publish@master
  with:
    user: __token__
    password: ***
    packages_dir: dist
  env:
    pythonLocation: /Users/runner/hostedtoolcache/Python/3.7.6/x64
##[error]Container action is only supported on Linux

https://github.com/aiortc/pylsqpack/runs/492017435

[webknjaz]

Duplicate of #15.

Solution: #15 (comment).