This removes the "busy", "locker" and "logfile" columns, which are no longer used by the queue runner. The "Running builds" page now only shows builds that have an active build step.
To start hacking on Hydra, run:
$ ./dev-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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