Several dependencies are missing when running the tests

[egouden]

I followed the instructions for contributing to the project.

When running the tests, the virtual environment is not recognized when running the notebooks. This is solved by installing the jupyter python package inside the virtual environement.

I had to install several additional packages to run the tests:

open_radar_data
cartopy
boto3
s3fs
zarr

ffmpeg is also required at the operating system level

I am wondering how the automatic CI is able to deal with the dependencies.