Allow to run CI on push to ci-branch
This PR allows to run the CI on push to a branch named "ci-*", without needing to open a PR.
- This will allow to make CI tests without opening a PR, e.g., for future `huggingface-hub` releases, future dependency releases (like `fsspec`, `pandas`,...)

Note that to build the documentation, we already allow it on push to a branch named "doc-builder*".

See:
- #5788

CC: @Wauplin  