tests: create a source tarball and use that to build a repo
tests: create a source tarball and use that to build a repo

This tests that setup.py is in working order and creating a functional
source tarball.

f-droid/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroid-server,matlink/fdroidserver,f-droid/fdroidserver,matlink/fdroidserver,matlink/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,matlink/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroid-server,matlink/fdroidserver,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroidserver,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server