Add sas private build flag

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

hosts/elara/default.nix

@@ -1,6 +1,8 @@
 { config, inputs, ... }:
 {
   imports = [
+    ./options.nix
+
     inputs.disko.nixosModules.disko
     ./format.nix
 
@@ -51,6 +53,8 @@
     ./users/nikara
   ];
 
+  sas.build.private = true;
+
   networking.hostName = "elara";
   i18n.defaultLocale = "en_US.UTF-8";
   sops.defaultSopsFile = ./secrets/secrets.yaml;