Since we want to run additional test configurations when triggered
by a push to prerelease_test or by cron but github actions don't
allow a dynamic matrix via yaml configuration we generate the matrix
with a python script. While we could always have the full matrix
and have if checks on every step that would make the actual checks
harder to browse because the workflow will have lots of entries and
only by navigating into the individual jobs would t sit be visible
if a job was actually run.
Additionally we set fail-fast to true for pull requests and false
for other event types.
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