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

# Example to import upstream 3.1.0 version
version=3.1.0
# 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
