nightly 3.6/3.21 fails due to no-py-3.6 on unbuntu-latest

[ggainey]

github action ubuntu-latest is unbuntu-20.04. That image no longer has python=3.6 : https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2004-Readme.md

This test needs to either specifically choose ubuntu-18.04, or we need to stop running it.

[mdellweg]

According to this document, 3.6.15 is available on 20.04.
https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

[ggainey]

According to this document, 3.6.15 is available on 20.04. https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

Ah, I see - it's installable, but doesn't come pre-installed. I think I got caught in the 20.04-to-22-as-ubuntu-latest change that just happened.

[mdellweg]

Still we need to do something. Consider the issue triaged.