added: enable info per default

fix: allow ca paths only

modules/nixos.nix

@@ -1,6 +1,5 @@
 { config, pkgs, lib, ... }: with lib; let
   cfg = config.services.ssh-cert-dist;
-  ca = if isPath cfg.ca then cfg.ca else pkgs.writeText "ssh-ca" cfg.ca;
 in
 {
   options.services.ssh-cert-dist = {
@@ -18,7 +17,7 @@ in
       default = pkgs.ssh-cert-dist;
     };
     ca = mkOption {
-      type = with types; either str path;
+      type = types.path;
     };
     dataDir = mkOption {
       type = types.path;