We are merging the upstream tags as upstream, instead of using the
tarball that doesn’t ship tests.

# Example to import upstream 2.7.0 version
version=2.7.0
# We still use the upstream branch to drop the .gitattributes file from upstream
gbp import-ref --upstream-tag=%\(version%~%-\)s -u$version --debian-branch=upstream
gbp import-ref --upstream-tree=BRANCH -u$version
