Add runHydra shell

runHyda automatically starts hydra and postgres:

$ nix-shell -A runHydra

The shell receives hydra from the working copy as buildInput. Running hydra, queue-runner, evaluator and postgres is managed by foreman (https://github.com/ddollar/foreman) and configured in Procfile.

Created by  Andreas Rammhold  on May 13, 2020
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