ci: use github token for authenticated requests in nix config

Author: astratagem

.github/workflows/check.yml

@@ -18,6 +18,7 @@ jobs:
     - uses: cachix/install-nix-action@v17
       with:
         extra_nix_config: |
+          access-tokens = github.com=${{ github.token }}
           system-features = nixos-test benchmark big-parallel kvm recursive-nix
           substituters = https://nrdxp.cachix.org https://nix-community.cachix.org https://cache.nixos.org
           trusted-public-keys = nrdxp.cachix.org-1:Fc5PSqY2Jm1TrWfm88l6cvGWwz3s93c6IOifQWnhNW4= nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=