Add nix flake for dev

Author: Pierre BAILLET

flake.lock

@@ -0,0 +1,39 @@
+{
+  description = "A basic Rust development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            # Rust toolchain
+            (rust-bin.stable.latest.default.override {
+              extensions = [ "rust-src" "rust-analyzer" ];
+            })
+
+            # Common Rust development tools
+            cargo
+            rustc
+            pkg-config
+            openssl
+          ];
+
+          shellHook = ''
+            echo "Rust development environment loaded!"
+            rustc --version
+          '';
+        };
+      });
+}