It would be useful to be able to supply defined configuration files to workflows.

Possibly it would suffice to make ConfigFileBuildStep be a SimpleBuildStep. CleanTempFilesRunListener cannot be made to work on a flow build (even if you accept any Run there is no guarantee the slave is still online at the end of the flow), so if cleaning files is important then this would better be a block-scoped custom Step.

Not sure what ConfigFileBuildWrapper is for as distinct from the build step, but probably it would be covered better by a block-scoped step.