Add CI workflow and enforce Rust 1.88 linting

flake.nix

@@ -71,7 +71,7 @@
         echo "    nix build .#develop  - Build development version"
         echo "    nix run .#develop    - Run development version"
         echo ""
-        cargo run -- -h
+        cargo run --locked -- -h
       '';
     };
   };