feat: add packages to checks

checks/default.nix

@@ -2,7 +2,8 @@
   pkgs,
   self,
 }: let
-  apps = import ./apps.nix {inherit pkgs self;};
-  nixosMachines = import ./machines.nix {inherit pkgs self;};
+  apps = import ./apps {inherit pkgs self;};
+  devices = import ./devices {inherit pkgs self;};
+  packages = import ./packages {inherit pkgs self;};
 in
-  apps // nixosMachines
+  apps // devices // packages

checks/packages/default.nix

@@ -0,0 +1,15 @@
+{
+  pkgs,
+  self,
+}: let
+  inherit (pkgs.lib) elem filterAttrs hasAttr;
+
+  packages =
+    filterAttrs (
+      _: v:
+        !(hasAttr "platforms" v.meta)
+        || elem pkgs.system v.meta.platforms
+    )
+    self.packages.${pkgs.system};
+in
+  packages