Desktop: Enable GPU nodes (#3364)

* desktop simple nix ci

* make workflow manual

* fixup

* fix nix shell

* nix fmt

* fix shell

.github/workflows/build-nix-package.yml

@@ -0,0 +1,17 @@
+name: Build Nix Package
+
+on:
+  workflow_dispatch: {}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Build Nix Package Dev
+        run: nix build .nix#graphite-dev --print-build-logs