Updated docs.

docs/INSTALLATION.md

@@ -105,23 +105,27 @@ docker run -p 8180:8180 \
 
 ## NixOS
 
-Turnpike builds with `buildGoModule` using the pure-Go SQLite driver (no CGO):
+Turnpike builds with `buildGoModule` + `buildNpmPackage` (pure-Go SQLite, no CGO). The frontend is built separately and copied into the Go build:
 
 ```nix
+frontendDist = pkgs.buildNpmPackage {
+  pname = "turnpike-frontend";
+  src = "${src}/frontend";
+  npmDepsHash = "sha256-...";
+  buildPhase = "npm run build";
+  installPhase = "cp -r dist $out";
+};
+
 turnpike = pkgs.buildGoModule {
   pname = "turnpike";
-  version = "0.1.0";
-  src = ./path/to/turnpike;  # must include vendor/ and frontend/dist/
-  vendorHash = null;
+  src = fetchgit { url = "..."; rev = "v2.0.0"; hash = "sha256-..."; };
+  vendorHash = "sha256-...";
   env.CGO_ENABLED = 0;
+  preBuild = "cp -r ${frontendDist} frontend/dist";
 };
 ```
 
-The source directory must contain:
-- Go source files and `vendor/` (run `go mod vendor`)
-- Pre-built frontend at `frontend/dist/` (run `cd frontend && npm run build`)
-
-A complete NixOS module example with `DynamicUser`, `StateDirectory`, and agenix secrets is in the project's `homelab/turnpike.nix`.
+A complete NixOS module with `DynamicUser`, `StateDirectory`, and secrets is in the project's `homelab/turnpike.nix`.
 
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