Fix release tests workflow
the cd workflow does not work properly, see https://github.com/cadet/CADET-Core/actions/runs/12296219136, even though the only difference to the CI workflow is that cadet-core is only build on linux and a different test flag is specified for the testrunner.
Maybe we dont even need a different workflow but can add the test flag to the ci workflow, with [CI] as default?
Could this be the issue: https://github.com/actions/checkout/issues/1326#issuecomment-2515889948
Could this be the issue: actions/checkout#1326 (comment)
Why would it work then for the CI workflow?
No idea... maybe because it's triggered differently?
I was just confused by the error message:
The process '/usr/bin/git' failed with exit code 1
and started googling.