check if common substituters are really required

[github-actions]

common substituters

os/setups/cache/default.nix

Line 50 in 7f41647

# TODO check if common substituters are really required

      };
      nix.settings.trusted-substituters = [
        "https://${domain}"
        # TODO check if common substituters are really required
        # common substituters
        "https://klarkc.cachix.org"
        "https://cache.iog.io"
        "https://cache.zw3rk.com"
        "https://hercules-ci.cachix.org"
        "https://horizon.cachix.org"
      ];
      nix.settings.trusted-public-keys = [
        (builtins.readFile ../../secrets/cache.pub)
        "klarkc.cachix.org-1:R+z+m4Cq0hMgfZ7AQ42WRpGuHJumLLx3k0XhwpNFq9U="
        "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
        "loony-tools:pr9m4BkM/5/eSTZlkQyRt57Jz7OMBxNSUiMC4FkcNfk="
        "hercules-ci.cachix.org-1:ZZeDl9Va+xe9j+KqdzoBZMFJHVQ42Uu/c/1/KMC5Lw0="
        "horizon.cachix.org-1:MeEEDRhRZTgv/FFGCv3479/dmJDfJ82G6kfUDxMSAw0="
      ];
      nix.extraOptions = ''
        min-free = 2684354560