Lock the GitHub CI runner to a specific Ubuntu version #3514
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We need to have control over our CI environment - we lock Fedora to a certain version without updates, yet the underlying Ubuntu image has been floating and causing trouble every now and then. Like just now, with ubuntu-latest moving from 22.04 to 24.04 where sudo is somehow broken inside our test-suite and causing totally unrelated PR's to fail with
sudo: PAM account management error: Authentication service cannot retrieve authentication info
sudo: a password is required
Lock the version to Ubuntu 22.04 for now, we'll need to eventually figure what the issue is but these things need to happen on our terms.