don't import cachix in suites

its already imported in the core profile

flake.nix

@@ -71,7 +71,7 @@
         ];
         profiles = [ ./profiles ./users ];
         suites = { profiles, users, ... }: with profiles; {
-          base = [ cachix core users.nixos users.root ];
+          base = [ core users.nixos users.root ];
         };
       };