Add hosts and packages to checks

checks.nix

@@ -2,6 +2,7 @@
   hooks,
   lib,
   system,
+  top,
   ...
 }:
 
@@ -37,3 +38,5 @@
     };
   };
 }
+// (builtins.mapAttrs (_n: v: v.config.system.build.toplevel) top.self.nixosConfigurations)
+// (top.self.packages.${system})

flake.nix

@@ -114,7 +114,7 @@
           packages = (import ./pkgs { inherit pkgs top; }) // (import ./vms { inherit top; });
 
           checks = import ./checks.nix {
-            inherit system;
+            inherit system top;
             inherit (top) hooks;
             inherit (pkgs) lib;
           };