Add nix dev shell

Author: stevenroose

flake.lock

@@ -0,0 +1,46 @@
+{
+	description = "rust-bitcoinkernel";
+
+	inputs = {
+		nixpkgs.url = "nixpkgs/nixos-25.05";
+		flake-utils.url = "github:numtide/flake-utils";
+		fenix = {
+			url = "github:nix-community/fenix";
+			inputs.nixpkgs.follows = "nixpkgs";
+		};
+	};
+
+	outputs = { self, nixpkgs, flake-utils, fenix }:
+		flake-utils.lib.eachDefaultSystem (system:
+			let
+				pkgs = import nixpkgs {
+					inherit system;
+				};
+
+				rustVersion = "1.71.0";
+				rustToolchain = fenix.packages.${system}.fromToolchainName {
+					name = rustVersion;
+					sha256 = "sha256-ks0nMEGGXKrHnfv4Fku+vhQ7gx76ruv6Ij4fKZR3l78=";
+				};
+				rustBuildToolchain = fenix.packages.${system}.combine [
+					rustToolchain.rustc
+					rustToolchain.cargo
+					rustToolchain.rust-src
+					rustToolchain.llvm-tools
+					rustToolchain.rust-std
+				];
+			in {
+				devShells.default = pkgs.mkShell {
+					packages = [
+						rustBuildToolchain
+
+						pkgs.cmake
+						pkgs.boost.dev
+						pkgs.cargo-fuzz
+					];
+
+					LIBCLANG_PATH = "${pkgs.llvmPackages.clang-unwrapped.lib}/lib/";
+				};
+			}
+		);
+}