Hi Daniel

        
Oh you have two installs of libvirt here. One in the Ubuntu image
that's running the job. This one lacks qemu-img. The second install
is the Docker container you've built which contains Fedora and has
qemu-img.

I can't tell which libvirt install your error is coming from, but
I'd guess the "host" Ubuntu one which lacks qemu-img

ignorant me, you're right!!! Ran also into issues for host/container libvirt pool discrepancies earlier on. Highly likely it's the host lacking qemu-img.

Confirming, cured it. Heaps of thanks for review!

-- 
All best!

Matthias