Unzip artifacts after upload (store_artifacts)

We use Sphinx to build our Python documentation and then store the artifact. GitHub then shows directly a link in the CI to open the index.html.

But when building Sphinx doc, thousands of files are created which slows down the upload of the artifact. To reduce upload time, from the doc, I can upload a compressed folder. But then, how to persist the uncompressed folder? This is needed as we have a file artifact_path which needs a path to the index.html. Or is there another way around this?

- store_artifacts:
    path: folder.tar  # untar after?

Disclamer: this is for SciPy, I am a core-dev. This would be extremely helpful as it takes around 30% of the build time of this pipeline.

from Unzip artifacts after upload (store_artifacts)