Fix Nix binary cache usage in CI

Author: berquist

.github/workflows/nix.yml

@@ -20,6 +20,9 @@ jobs:
           nix_path: nixpkgs=channel:nixos-unstable
       # Pull from the cachix cache
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
+        with:
+          name: cclib
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       # Checkout of the current head in the working dir
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Check nix flake