Vulkan based tests

[Simon Richter <sjr@debian.org>]

Hi,

I'm once again working on packaging ngscopeclient, which comes with a 
few unit tests that submit workloads via Vulkan.

I've patched the package to skip tests if the Vulkan runtime does not 
have access to any execution units -- which is basically any autobuilder 
environment.

Can we do better though? Do we have a mechanism to run autopkgtests on 
different GPUs?

   Simon