The .tarball-version file should contain the *source version* uniquely
identifying the git commit, and not the Debian package name.
With https://gerrit.osmocom.org/#/c/osmo-ci/+/10343/ there is a correct
.tarball-version file in the .tar.xz of the nightly source packages.
Related: OS#3449
Change-Id: I22dac8524ce8acb033dc9c72eab107999f49f975