tests: CI/CD pipeline (tmt) - generate QCOW2 image as soon ALL tests PASSED in the pipeline

[dougsland]

Let met start saying I am not sure if we have the resources to accomplish that via github or gitlab but let me add the scenario and requirements.

Imagine the scenario of new patch arriving to the project, CI/CD pipeline is triggered and it PASSED in all tests, the next step (which is about this issue) is generate a QCOW2 image with the new patch INCLUDED in the QM RPM available for download so developers and quality engineers can easily download and test it.

Example:

Imagine a new SELinux policy patch arriving for QM, would be very nice to have such patch included. 
into qm project and generated a QCOW2 image so all developers/testers can easily test if the patch. 
really fix what it should be fixed.

Finally, I am sure, this is not something exclusive for QM project, probably all components for centOS auto, like BlueChi could take adv. of such strategy and integration.

See-Also:
How to build QM RPM / CentOS Auto:
https://github.com/containers/qm/tree/main/docs/devel#building-qm-rpm-manually-with-changes

[dougsland]

Adding some folks in CC from automation, QE, Fedora/CentOS maintainers that might have some ideas about resources too.

cc @pbrilla-rh @juanje @Yarboa @pypingou @mwperina @sandrobonazzola