add nix flake for building solana-toolbox-cli

flake.nix

@@ -0,0 +1,93 @@
+{
+  description = "Solana Toolbox CLI - A toolbox for interacting with Solana programs";
+
+  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;
+        };
+
+        rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+          extensions = [ "rust-src" "rustfmt" "clippy" ];
+        };
+
+        # Native build inputs for Solana development
+        nativeBuildInputs = with pkgs; [
+          pkg-config
+          openssl
+          rustToolchain
+        ];
+
+        # Build inputs for Solana development
+        buildInputs = with pkgs; [
+          openssl
+          libudev-zero
+          libusb1
+        ] ++ lib.optionals stdenv.isDarwin [
+          darwin.apple_sdk.frameworks.AppKit
+          darwin.apple_sdk.frameworks.IOKit
+        ];
+
+        # Environment variables for the build
+        env = {
+          OPENSSL_NO_VENDOR = "1";
+          OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
+          OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include";
+        };
+
+      in
+      {
+        packages = {
+          default = self.packages.${system}.solana-toolbox-cli;
+
+          solana-toolbox-cli = pkgs.rustPlatform.buildRustPackage {
+            pname = "solana-toolbox-cli";
+            version = "0.4.2";
+
+            src = ./solana_toolbox_cli;
+
+            cargoLock = {
+              lockFile = ./solana_toolbox_cli/Cargo.lock;
+            };
+
+            inherit nativeBuildInputs buildInputs;
+            inherit env;
+
+            # Skip tests during build as they may require network access
+            doCheck = false;
+
+            meta = with pkgs.lib; {
+              description = "Toolbox for interacting with Solana programs through CLI";
+              homepage = "https://github.com/your-username/solana-toolbox";
+              license = licenses.mit;
+              maintainers = [ ];
+              platforms = platforms.all;
+            };
+          };
+        };
+
+        devShells.default = pkgs.mkShell {
+          inherit buildInputs nativeBuildInputs;
+          inherit env;
+
+          shellHook = ''
+            echo "Solana Toolbox CLI development environment"
+            echo "Available commands:"
+            echo "  cargo build --release"
+            echo "  cargo test"
+            echo "  cargo run -- --help"
+          '';
+        };
+
+        # Formatter for nix files
+        formatter = pkgs.nixpkgs-fmt;
+      });
+}