chore(devenv): update flake setup

flake.nix

@@ -4,22 +4,55 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
     systems.url = "github:nix-systems/default-linux";
+
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+
+    nix-tools.url = "github:gleachkr/nix-tools";
+    nix-tools.inputs.nixpkgs.follows = "nixpkgs";
   };
 
-  outputs = {
+  outputs = inputs @ {
     self,
     nixpkgs,
     systems,
+    rust-overlay,
+    nix-tools,
   }: let
-    forAllSystems = nixpkgs.lib.genAttrs (import systems);
-    pkgsFor = nixpkgs.legacyPackages;
+    lib = nixpkgs.lib;
+    pkgsFor = lib.genAttrs (import systems) (system: (import nixpkgs {
+      inherit system;
+      overlays = [(import rust-overlay) nix-tools.overlays.default];
+    }));
+    forEachSystem = f: lib.genAttrs (import systems) (system: f pkgsFor.${system});
   in {
-    devShells = forAllSystems (system: {
-      default = pkgsFor.${system}.callPackage ./shell.nix {};
+    devShells = forEachSystem (pkgs: {
+      default = let
+        libs = with pkgs; [openssl xz bzip2];
+      in
+        pkgs.mkShell rec {
+          nativeBuildInputs = with pkgs; [
+            llvmPackages_12.bintools
+            pkg-config
+            clang
+            cmake
+            (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
+            cargo-rdme
+            cargo-nextest
+            release-plz
+            jq
+            maturin
+            kani
+          ];
+          buildInputs = libs;
+          LIBCLANG_PATH = lib.makeLibraryPath [pkgs.llvmPackages_12.libclang.lib];
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath libs;
+          PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig/";
+        };
     });
 
-    packages = forAllSystems (system: {
-      tools = pkgsFor.${system}.callPackage ./tools {};
+    packages = forEachSystem (pkgs: {
+      tools = pkgs.callPackage ./tools {};
     });
   };
 }