feat: distributed builder work

common/distributed.nix

@@ -0,0 +1,28 @@
+{ lib, config, inputs, ... }: let
+  inherit (lib.attrsets) mapAttrsToList;
+  inherit (lib.lists) optionals;
+  buildMachines = mapAttrsToList (name: config_: let
+    config = config_.config;
+  in {
+    hostName = "${config.networking.hostName}.inskip.me";
+    sshUser = "deploy";
+    systems = [ config.nixpkgs.system ] ++ optionals (config.nix.settings ? extra-platforms) config.nix.settings.extra-platforms;
+    maxJobs = 100;
+    speedFactor = 1; # TODO: provide adjustment factor
+    supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+  } ) inputs.self.nixosConfigurations;
+  daiyousei = {
+    hostName = "daiyousei.inskip.me";
+    sshUser = "root";
+    system = "aarch64-linux";
+    maxJobs = 100;
+    speedFactor = 1;
+    supportedFeatures = ["benchmark" "big-parallel" "kvm"];
+    mandatoryFeatures = [];
+  };
+in {
+    nix = {
+      inherit buildMachines;
+      distributedBuilds = true;
+    };
+}

common/network.nix

@@ -0,0 +1,3 @@
+{ machine, ... }: {
+  networking.hostName = machine;
+}