This reverts commit 949e5865c60323800f8bd5706842348e3e4437bf. This makes release.nix harder to read/maintain IMHO. There already is a Nix expression for Hydra in Nixpkgs that can be used for this purpose.
Hydra
Hydra is a continuous integration system based on the Nix package manager. For more information, see the manual.
For development see [hacking instructions] (http://nixos.org/hydra/manual/#chap-hacking).
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