set up distributed builds

hosts/kalessin/default.nix

@@ -1,5 +1,8 @@
 { config, lib, pkgs, ... }:
 
+let
+  keys = import ../../keys.nix;
+in
 {
   imports = [
     ./hardware-configuration.nix
@@ -12,10 +15,15 @@
 
   fountain.users.qenya.enable = true;
   users.users.qenya.extraGroups = [ "wheel" ];
-
   fountain.users.trungle.enable = true;
 
   qenya.base-server.enable = true;
+  
+  qenya.services.remote-builder = {
+    enable = true;
+    authorizedKeys.keys = [ keys.machines.tohru ];
+  };
+  boot.binfmt.emulatedSystems = [ "x86_64-linux" ];
 
   system.stateVersion = "23.11";
 }

hosts/tohru/default.nix

@@ -46,6 +46,12 @@
     ];
   };
 
+  qenya.services.distributed-builds = {
+    enable = true;
+    keyFile = "/etc/ssh/ssh_host_ed25519_key";
+    builders = [ "kalessin" ];
+  };
+
   programs.evolution.enable = true; # not in home-manager yet; not declaratively configurable yet
   programs.steam.enable = true;