Add Nix flake

Author: JonasWanke

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,3 +1,5 @@
+.direnv/
+
 # compiled output
 /dist
 /node_modules

flake.lock

@@ -0,0 +1,20 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [
+          (final: prev: rec {
+            nodejs = prev.nodejs_18;
+            pnpm = (prev.nodePackages.pnpm.override { inherit nodejs; });
+          })
+        ];
+        pkgs = import nixpkgs { inherit overlays system; };
+      in {
+        devShell = with pkgs; mkShell { buildInputs = [ docker nodejs pnpm ]; };
+      });
+}