fix(ci): unexpected keyword argument `streaming` (#42102)
* debug(ci): run `pwd` to check what we're working with
* fix(ci): `ls -lR`
* fix(ci): remove working directory which should not be there?
* fix(cb): make sure memory is freed when calling `stop`
* fix(ci): effectively clear cache
* fix(ci): reduce memory safety margin
* refactor(cb): add fixme note on default safety margin value
