For example, steps that require the "kvm" feature may require a different kind of machine to be provisioned. This can also be used to require performance-sensitive tests to run on a particular kind of machine, e.g., by setting requiredSystemFeatures to something like "ec2-i2.8xlarge".
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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