Fake-Batch downloads production compiler during local testing

[CampGareth]

Right now fake-batch is wired up so that in testing it attempts to pull in our production reco-sdaccel container image. Setting aside matters like whether that image is going to be used going forward, it's not a very good resource for testing against. It relies on vivado which is not on developer machines and if it were to run end to end it would take hours.

This might be a good time to revive this PR: #266
We can have the image be automagically made and run basic scripts as a fake workflow that generates logs, sends reports, etc. Meanwhile fake-batch can be made to pull this image by default if it's in a test environment.