This reverts commit 5e8545e723. It breaks eval: attribute 'rev' missing, at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/eval-0-gleber.ewr1.nix.ci/pkgs/top-level/make-tarball.nix:106:39
5e8545e723
Also change incorrect 'revision' to 'rev' in the default value for 'nixpkgs' in release.nix. Fixes https://github.com/NixOS/nixos-homepage/issues/372.