Currently upstream does not provide any release tarballs
or release tags in git. Thus the .orig.tar.gz provided in
the Debian archive is manually cut from the upstream git
clone. E.g.

    git archive --format=tar.gz -o ~/debian/vym-2.9.27.tar.gz --prefix=vym-2.9.27/ d9d7b12a05dcffe3bf246cbb73e1cf718bd9dcd7

and imported with `gbp import-orig ../vym-2.9.27.tar.gz`.