workflows: Add deploy stage to CI pipeline

.github/workflows/test.yml

@@ -1,15 +0,0 @@
-name: "Test"
-on:
-  pull_request:
-  push:
-jobs:
-  tests:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-      - uses: cachix/install-nix-action@v31
-      - uses: cachix/cachix-action@v15
-        with:
-          name: sebastian-stork
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-      - run: nix flake --extra-experimental-features pipe-operators check