Check for coredumps and only execute the stracktrace if there are
actually coredumps. This patch also changes the log handling to
always collect logs and upload them cause they might have useful
information even when all steps succeed. Additionally a list
of all failed tests is shown before the regression diff.
This patch also disables fail-fast so a single failed job does
not cancel other jobs still in progress.
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.
