Created Turnpike, event attendee and volunteer management

Built after prototype, Traverse, an attendee and volunteer list
maintainer.

flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "Turnpike — event attendee & volunteer management";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            go
+            gopls
+            gotools
+            nodejs_22
+            nodePackages.npm
+          ];
+
+          shellHook = ''
+            echo "turnpike dev — go $(go version | awk '{print $3}'), node $(node --version)"
+          '';
+        };
+      });
+}