Test more compilers

[Davknapp]

Feature request

We are currently only testing using the gcc compilers.

Is your feature request related to a problem? Please describe.

Describe the solution or feature you'd like
At least the nightly build should use a broader variance of compiliers. It would be a good compromise between elaborate testing and no-increase in run-time of our PR-testsuite.

Describe alternatives you've considered

Estimated priority
"Priority: low" Should be solved eventually

Additional context
Add any other context or screenshots about the feature request here.