nausicaa: use rexxar for builds

ops/nixos/lib/home-manager/graphical-client-wayland.nix

@@ -8,7 +8,6 @@
     swayidle
     wl-clipboard
     waybar
-    mako
     kanshi
 
     qt5.qtwayland

ops/nixos/lib/rexxar-distributed.nix

@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2020 Luke Granger-Brown <depot@lukegb.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+{ lib, config, ... }:
+{
+  nix.buildMachines = lib.mkAfter [ {
+    hostName = "rexxar";
+    system = "x86_64-linux";
+    maxJobs = 64;
+    speedFactor = 12;
+    supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+    mandatoryFeatures = [ ];
+  } {
+    hostName = "rexxar";
+    system = "aarch64-linux";
+    maxJobs = 64;
+    speedFactor = 12;
+    supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+    mandatoryFeatures = [ ];
+  }];
+  nix.distributedBuilds = true;
+}

ops/nixos/nausicaa/default.nix

@@ -11,7 +11,8 @@ in {
     ../lib/graphical-client-wayland.nix
     ../lib/plasma.nix
     #../lib/whitby-distributed.nix
-    ../lib/nixbuild-distributed.nix
+    #../lib/nixbuild-distributed.nix
+    ../lib/rexxar-distributed.nix
     ../lib/quadv-ca/default.nix
     ((import ../../../third_party/lanzaboote.nix { }).nixosModules.lanzaboote)
   ];