clippy pedantic clean + wired into flake checks

flake.nix

@@ -124,9 +124,18 @@
       formatter = forAllSystems ({ treefmt-eval, ... }: treefmt-eval.config.build.wrapper);
 
       checks = forAllSystems (
-        { treefmt-eval, ... }:
+        {
+          treefmt-eval,
+          naersk-lib,
+          ...
+        }:
         {
           formatting = treefmt-eval.config.build.check self;
+          clippy = naersk-lib.buildPackage {
+            src = ./.;
+            mode = "clippy";
+            cargoClippyOptions = orig: orig ++ [ "--all-targets" "--" "-D" "warnings" ];
+          };
         }
       );
     };