feature(ci): use DeterminateSystems nix cache

Author: blackheaven

.github/workflows/nix.yml

@@ -28,6 +28,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
       - name: Check Nix flake inputs
         uses: DeterminateSystems/flake-checker-action@v4
         with: