Integration Tests don't run in robust manner

[nyuuyn]

Current Behavior:
Sometimes the tests fail and sometimes they don't, the behaviour is rather non-deteministic, since the tests are running in parallel now.
Maybe the github flows are sharing some state? See e.g. #309

[nyuuyn]

@PhilWun @lharzenetter any insights ?

[lharzenetter]

I don't now why this appears:

It seems like the test ran successfully but was canceled from the outside.

[nyuuyn]

some test fails and cancels the others but @mar-be and I are looking into and don't find proper issues. The tests run fine locally and after a restart on github as well

[PhilWun]

According to actions/runner-images#1918 this can happen if the job uses too much memory or a timeout was triggered. The timeout for the tests is 80 minutes so that shouldn't be the issue, but I don't know how much memory is available for the jobs.

[nyuuyn]

If we look into the logs of the runner/worker itself we see the following:

Maybe the network is a bit full and then everything goes FUBAR? Or github itself has an issue right now?