This prevents the server from gradually filling up due to store paths fetched by hydra-server that then get turned into a GC root by hydra-update-gc-roots.
To start hacking on Hydra, run:
$ bootstrap
$ nix-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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