I don't know if i like this

nixosModules/builders.nix

@@ -0,0 +1,44 @@
+{ config, lib }:
+{
+  options.local.remoteBuild.enable = lib.mkEnableOption "";
+
+  config = lib.mkMerge [
+    (lib.mkIf config.local.remoteBuild.enable {
+      nix = {
+        settings = {
+          keep-outputs = false;
+          keep-derivations = false;
+          builders-use-substitutes = true;
+          max-jobs = 0;
+          substituters = [ "https://cache.gerg-l.com" ];
+          trusted-public-keys = [ "cache.gerg-l.com:6p1+h6jQnb1MOt3ra3PlQpfgEEF4zRrQWiEuAqcjBj8=" ];
+        };
+        distributedBuilds = true;
+        buildMachines = [
+          {
+            hostName = "gerg-desktop";
+            protocol = "ssh-ng";
+            maxJobs = 32;
+            systems = [
+              "x86_64-linux"
+              "i686-linux"
+            ];
+            supportedFeatures = [
+              "big-parallel"
+              "nixos-test"
+              "kvm"
+              "benchmark"
+            ];
+            sshUser = "builder";
+            sshKey = "/etc/ssh/ssh_host_ed25519_key";
+            publicHostKey = config.local.keys.gerg-desktop_fingerprint;
+          }
+        ];
+      };
+      programs.ssh.knownHosts.gerg-desktop = {
+        extraHostNames = [ "gerg-desktop.lan" ];
+        publicKey = config.local.keys.root_gerg-desktop;
+      };
+    })
+  ];
+}