Create tarball and hash
Automatically create tarball and accompanying hash to be available in gitlab download section for build job. Also makes it easier to link other Makefiles (e.g. OpenWRT) directly to gitlab using URI:
e.g.:
https://gitlab.freedesktop.org/wicadmin/ModemManager/-/jobs/4717819/artifacts/raw/ModemManager-1.15.0.tar.xz
where 4717819 is the job id of a particular commit build.
Edited by Capt. Jack