How can one run complex python codes/ use Github repositories in Terra?

Hi!

Let's say I want to use code from a certain GitHub repository to perform some analyses in Terra.
Should I :

1) "clone"/copy the repository as files in the Data/ Other Data section, and then perform the analyses by somehow calling them in a Jupyter Notebook in the Analyses tab. Is that even possible?
2) pip install the repository in the cloud environment every time an environment is created (pip install in the Jupyter notebook code).

3) What is the wdl-friendly way to do that?

Thanks!!

Marc