add flake

Author: yanganto

flake.lock

@@ -0,0 +1,30 @@
+{
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url = "github:numtide/flake-utils";
+    dependency-refresh.url = "github:yanganto/dependency-refresh";
+  };
+
+  outputs = { self, rust-overlay, nixpkgs, flake-utils, dependency-refresh }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+        rust = pkgs.rust-bin.stable.latest.default;
+      in
+      with pkgs;
+      {
+        devShell = mkShell {
+          buildInputs = [
+            openssl
+            pkg-config
+            rust
+          ];
+        };
+      }
+    );
+}