Set up CI for the Hub

[khider]

Using some of the most used functions in the tutorials, set up some CI tests (i.e., run a Jupyer Notebook) to make sure the container has the proper code.

• [ ] @CommonClimate, please think of some tests we should run automatically on notebooks
• [ ] @khider, set up the GitHub action

[CommonClimate]

I don't know if notebooks are the best way to test in a CI context. Maybe Chris Holdgraf has ideas on this? Otherwise, my idea would be to pick snippets from notebooks and turn them in pytests.

[jordanplanders]

Maybe something like the workflow in this post might help? There seems to be a method for applying pytest to notebooks.