ci: run KVM jobs on GitHub runners

[mkroening]

This allows running the Uhyve CI without requiring self-hosted runners.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.67%. Comparing base (b63a14f) to head (c753d59).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #748   +/-   ##
=======================================
  Coverage   71.67%   71.67%           
=======================================
  Files          25       25           
  Lines        3181     3181           
=======================================
  Hits         2280     2280           
  Misses        901      901           

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[jounathaen]

So we had an internal discussion, and came to the conclusion that a switch only provides minor benefits at the moment and keeping a little independence with our infrastructure is a value on its own.

But we keep the PR open, so we can easily adapt if the need for the GH runners occurs.