As part of T257906: Move testreduce away from scandium to a separate Buster Ganeti VM, scandium is losing all node.js code and testreduce1001 will be used to run rt-testing services.

But, this will disrupt the tools/regression-testing.js script since (a) it can only be run on testreduce1001 (b) as written, it updates git checkout on the same server (testreduce1001) (c) but the parsoid/php code that it uses runs on scandium.

So, the regression testing tool will now need to remotely checkout code on scandium (and need to have the appropriate credentials) to enable that.