Description of problem:
With changes to image names in CNV following rhel9 (-rhel9 suffix), guestfs image URL now fails to be constructed

Version-Release number of selected component (if applicable):
CNV 4.13

How reproducible:
100%

Steps to Reproduce:
1. Run virtctl guestfs
2.
3.

Actual results:
"Neither the digest nor the tag for the image has been specified"

Expected results:
Success

Additional info:
After a discussion with Simone seems we have the full URL exposed to us
as env var and we should use it instead of constructing