[galaxy-dev] Write all intermediate workflow data to /tmp/ only

I'm working with a lot of data on a cluster (condor). If I save all the workflow intermediate data, as Galaxy does by default (and rightfully so), it fills the drives. How can tell Galaxy to use /tmp/ to store all intermediate data in a workflow, and keep the result? I imagine I'll have to work on how Galaxy handles jobs, but I'm hoping there is something built in for this. Thanks