Add a config for the disc recovery machine.

nix/configuration/hosts/recovery/distributed_build.nix

@@ -0,0 +1,19 @@
+{
+  imports = [ ];
+
+  config = {
+    me.distributed_build.enable = true;
+    me.distributed_build.machines.hydra = {
+      enable = true;
+      additional_config = {
+        speedFactor = 2;
+      };
+    };
+    me.distributed_build.machines.quark = {
+      enable = true;
+      additional_config = {
+        speedFactor = 2;
+      };
+    };
+  };
+}