Hi Julien,
> but I understand that you do that from the debian git
> repositories, right? So if I push a commit tagged 2.3.0 to git.debian.org,
> then you will automatically create a new version of the package, is that
> correct?
Sorry, no. You push a tag to github (or whatever repository you might
use) and uscan will recognise a new version. It will download the
according tarball and this tarball will be used as source tarball for
the next package.