This is the first step to have some tests, that we could run against an
MBS instance, to check that it's functionally correct. Ultimately, these
will replace the test scripts (`contrib/test-*`).
This doesn't really do anything yet, but I would like to make sure that
everyone is on the same page regarding how this will be set up.
Signed-off-by: Hunor Csomortáni <csomh@redhat.com>