Give WK direct access to /tmpscratch

[philippotto]

Copying from /tmpscratch to /wklive is a bottleneck. Additional /wkscratch might no be necessary.

[normanrz]

@fm3 wouls it be feasible that the datastore watches multiple folders?

[fm3]

I think we could change it to do that, yes. I’ll have a look next week

[jstriebel]

@normanrz Do you know if it would be easy to mount /tmpscratch? I'm not aware of the internal filesystem workflows. But if that's easily possible, we might just do this and watch multiple folders.
Who would be affected from the lab?

[fm3]

closed by #3330 and various changes in the garching deployment