Add nix-fast-build

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/nix/default.nix

@@ -43,7 +43,6 @@
       ];
       download-buffer-size = 524288000;
       substituters = lib.mkBefore [ "https://nix.karaolidis.com/main" ];
-      trusted-substituters = config.nix.settings.substituters;
       trusted-public-keys = lib.mkBefore [ "main:nJVRBnv73MDkwuV5sgm52m4E2ImOhWHvY12qzjPegAk=" ];
       netrc-file = config.sops.templates.nix-netrc.path;
     };

hosts/common/configs/user/console/home-manager/default.nix

@@ -26,7 +26,6 @@
           experimental-features
           download-buffer-size
           substituters
-          trusted-substituters
           trusted-public-keys
           netrc-file
           ;

hosts/common/configs/user/console/nix/default.nix

@@ -4,7 +4,10 @@
   environment.persistence."/persist/cache"."${home}/.cache/nix" = { };
 
   home-manager.users.${user} = {
-    home.packages = with pkgs; [ nurl ];
+    home.packages = with pkgs; [
+      nix-fast-build
+      nurl
+    ];
 
     programs.zsh.shellAliases = {
       nrs = "sudo nixos-rebuild switch --flake .#$(hostname) --show-trace";