Add flake for devshell

flake.nix

@@ -0,0 +1,25 @@
+{
+	inputs = {
+		utils.url = "github:numtide/flake-utils";
+		nixpkgs.url = "nixpkgs/nixos-unstable";
+	};
+
+	outputs = { self, nixpkgs, utils }:
+		utils.lib.eachDefaultSystem (system:
+			let
+				pkgs = nixpkgs.legacyPackages."${system}";
+			in rec {
+				devShell = pkgs.mkShell {
+					shellHook = ''
+						export SHELL=${pkgs.fish}/bin/fish
+					'';
+					nativeBuildInputs = with pkgs; [
+						go_1_24
+						gopls
+						golangci-lint
+						golangci-lint-langserver
+					];
+				};
+			}
+		);
+}