add github action to test installation

[kevinyamauchi]

Hello @haesleinhuepf ! I think it would be nice to have a scheduled github that once every day/week/month it tests installing devbio-napari. The goal would be to:

• make sure the standard one line installation is working
• determine if any packages have been updated and are thus no longer compatible

I think the workflow would be something like:

• run on Windows, Mac OS, Linux with python 3.8 and 3.9
• install with conda create --name devbio-napari-env python=3.9 devbio-napari -c conda-forge (could also have mamba)
• run a function that tries to import all of the plugins that should be installed. if some modules that should be installed raise an ImportError, raise an exception and return the list of plugins that failed