treewide: fixup builder config

Changed files
+1 -2
global
programs
systems
+1
global/programs/nix/dist-builds.nix
···
};
nix.distributedBuilds = true;
+
nix.settings.builders-use-substitutes = true;
nix.buildMachines = mkBuildMachines {
renko = {
supportedFeatures = baselineFeatures ++ ["kvm" "nixos-test"];
-2
systems/renko/configuration.nix
···
# muh unfree software!!!!!!!!!!!!!!!!!!
nixpkgs.config.allowUnfree = true;
-
nix.distributedBuilds = lib.mkForce false;
-
system.stateVersion = "23.11"; # Did you read the comment? Yes.
}