We should be confident about the Python versions that each CKAN version supports and be able to test support for new versions easily.
Also have a good test environment to discuss issues like #6613.

So let's create a monitor repo like the one that @pdelboca created for extensions (https://github.com/ckan/ckan-extensions-monitor) but running the CKAN core tests under different Python versions:

• CKAN 2.9: Python 3.7 to 3.9
• CKAN 2.10: Python 3.7 to 3.10
• [Optional] Master

I know tests will take a long time to run as we won't split them as we do in CircleCI but we should fall well within GitHub Actions limits and this are not meant to be constantly monitored.
In the future we can add other combinations like CKAN + Postgres or Solr versions