🔧 epicurus: configure remote builder

modules/builder/default.nix

@@ -0,0 +1,11 @@
+{ config, lib, pkgs, ... }:
+{
+  nix.distributedBuilds = true;
+  nix.buildMachines = [{
+    hostName = "plato";
+    systems = [ "x86_64-linux" "aarch64-linux" ];
+    maxJobs = 12;
+    speedFactor = 2;
+    supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+  }];
+}