Add a workflow or jobs that run all tests before a merge is done

[btschwertfeger]

Describe the solution you'd like
There should be all tests run before a merge can be done and not just for Python3.11.

see

• https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue#triggering-merge-group-checks-with-github-actions
• https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/defining-the-mergeability-of-pull-requests