Remove this miserable nix.distributedBuilds shit

hosts/hydra/configuration.nix

@@ -7,7 +7,6 @@
     ./cache.nix
     ../../lib
     ../../lib/hq.nix
-    ../../lib/buildfarmer.nix
     ../../lib/yggdrasil.nix
   ];
 
@@ -49,7 +48,6 @@
   programs.mosh.enable = true;
 
   nix = {
-    distributedBuilds = true;
     package = pkgs.nixFlakes;
     useSandbox = false;
     maxJobs = lib.mkDefault 10;

hosts/hydra/hydra.nix

@@ -2,19 +2,24 @@
 
 {
   nix = {
-    binaryCaches = [ "https://cache.nixos.org" "https://cache.dhall-lang.org" ];
-    binaryCachePublicKeys =
-      [ "cache.dhall-lang.org:I9/H18WHd60olG5GsIjolp7CtepSgJmM2CsO813VTmM=" ];
-    buildMachines = [{
-      hostName = "server7.hq.c3d2.de";
-      system = "x86_64-linux";
-      sshUser = "buildfarmer";
-      sshKey = "/root/.ssh/id_ed25519";
-      maxJobs = 10;
-    }];
+    binaryCaches = [
+      "https://cache.server7.hq.c3d2.de"
+      "https://cache.nixos.org"
+      "https://cache.dhall-lang.org"
+    ];
+    binaryCachePublicKeys = [
+      "cache.server7.hq.c3d2.de:x8JLRG26zRZ8ysYZLEkPxuAYuK1VSJi/aMAEIs2Lv+U="
+      "cache.dhall-lang.org:I9/H18WHd60olG5GsIjolp7CtepSgJmM2CsO813VTmM="
+    ];
     extraOptions = ''
       allowed-uris = http:// https://
     '';
+    buildMachines = [{
+      hostName = "localhost";
+      system = "x86_64-linux";
+      supportedFeatures = [ "kvm" "nixos-test" "big-parallel" "benchmark" ];
+      maxJobs = 8;
+    }];
   };
 
   services.hydra = {

hosts/server7/configuration.nix

@@ -6,7 +6,6 @@ in {
     <nixpkgs/nixos/modules/profiles/minimal.nix>
     ../../lib
     ../../lib/default-gateway.nix
-    ../../lib/buildfarmer.nix
     ../../lib/yggdrasil.nix
     ./containers
     ./hardware-configuration.nix

lib/buildfarmer.nix

@@ -1,15 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  users.users.buildfarmer = {
-    isNormalUser = false;
-    description = "User for remote Nix builds";
-    useDefaultShell = true;
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMwS9B/d6QJUyZW9b52R2TlJgkI5oGDyOvzMN7H9Cz4/ hydra@hydra"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINA3x2+5ieo5QgehFHqXCYAYZSP8dxXyE1E/fSLnny8y root@serve7"
-    ];
-  };
-
-  nix.trustedUsers = [ "buildfarmer" ];
-}