builder: fix config for installation

hosts/builder/default.nix

@@ -6,6 +6,7 @@
   config,
   inputs,
   outputs,
+  lib,
   ...
 }: {
   imports =
@@ -94,12 +95,12 @@
   };
 
   # optimize store by hardlinking store files
-  nix.optimise.automatic = true;
-  nix.optimise.dates = ["03:15"];
+  nix.optimise.automatic = lib.mkForce true;
+  nix.optimise.dates = lib.mkForce ["03:15"];
 
-  nix.gc.automatic = true;
-  nix.gc.dates = "daily";
-  nix.gc.options = "--delete-old";
+  nix.gc.automatic = lib.mkForce true;
+  nix.gc.dates = lib.mkForce "daily";
+  nix.gc.options = lib.mkForce "--delete-old";
 
   # nix.settings.keep-derivations = false;
   # nix.settings.keep-outputs = true;

hosts/builder/hardware-configuration.nix

@@ -14,7 +14,6 @@
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
   boot.loader.grub.enable = true;
-  boot.loader.grub.device = "/dev/sda";
 
   # Emulated systems used as alternative to cross-compiling
   boot.binfmt.emulatedSystems = ["aarch64-linux"];