GitHub Actions env should support lists

I am using GitHub actions but would like the “configuration” options “up front” at the top of my workflow file. I’ve tried using env for this but I cannot define a list of supported Python releases here in a form that I can use to set a test matrix later. env variables needs to support lists please.

what do you want to do is this?

python-version: ['2.7', '3.6', '3.7', '3.8', 'pypy-2.7', 'pypy-3.6']

If so, you can see more examples here: GitHub - actions/setup-python: Set up your GitHub Actions workflow with a specific version of python