Improve zip_directory

The way we are zipping the repository to upload it to the OSSR (zip_reposisoty in utils.py) is not very clean. We are making a copy of the dir and zipping it.

Possible improvement; add a exclude dir starting from source code of shutil.make_archive https://github.com/python/cpython/blob/81520fe677d15cc7f9af5140bc5f9eca8409ad90/Lib/shutil.py#L946