[issue39041] Support GitHub Actions in CI

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Have merged the core support. Now that checks are enabled, any updates to the workflow files can be tested in PRs, so that will be much easier.

Other things to do:
* badges
* disable Azure Pipelines for PR builds
* ...? What have I missed?

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<https://bugs.python.org/issue39041>
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