setup remote build on genepi from haze

hosts/haze/default.nix

@@ -28,4 +28,20 @@
       home-manager.extraSpecialArgs = { inherit inputs; };
     }
   ];
+
+  # Remote builds
+  nix = {
+    distributedBuilds = true;
+    buildMachines = [
+      {
+        sshUser = "nixremote";
+        sshKey = "/etc/ssh/ssh_host_ed25519_key";
+        systems = [ "aarch64-linux" ];
+        hostName = "genepi";
+      }
+    ];
+    extraOptions = ''
+      builders-use-substitutes = true
+    '';
+  };
 }