feat: setup nix flake

flake.nix

@@ -0,0 +1,22 @@
+{
+  description = "NodeiWest dev environment module";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+  };
+
+  outputs =
+    inputs:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "aarch64-darwin"
+        "x86_64-darwin"
+        "x86_64-linux"
+      ];
+
+      flake = {
+        homeManagerModules.default = ./modules/home.nix;
+      };
+    };
+}

modules/home.nix

@@ -0,0 +1,15 @@
+{ pkgs, lib, ... }:
+{
+  # Company env vars — available in all shells
+  home.sessionVariables = {
+    BAO_ADDR = "https://secrets.api.nodeiwest.se";
+    SOME_REGISTRY = "git.dgren.dev";
+    # etc.
+  };
+
+  home.packages = with pkgs; [
+    # Tools every dev needs
+    openbao
+    # etc.
+  ];
+}