added: options

added: dev env

modules/options.nix

@@ -16,11 +16,14 @@
     };
   };
   endpointOption = mkOption {
-    type = types.str;
+    type = with types; nullOr str;
     description = "API endpoint url";
     default = "https://pki.shimun.net";
   };
-
+  packageOption = mkOption {
+    type = types.package;
+    default = pkgs.ssh-cert-dist;
+  };
 
 in
 {
@@ -28,6 +31,7 @@ in
     services.ssh-cert-dist = {
       enable = mkEnableOption "ssh-cert-dist";
       endpoint = endpointOption;
+      package = packageOption;
       directories = mkOption {
         type = with types; attrsOf (submodule directoryModule);
         default = { };
@@ -35,6 +39,7 @@ in
     };
     programs.ssh-cert-dist = {
       enable = mkEnableOption "ssh-cert-dist client";
+      package = packageOption;
       endpoint = endpointOption;
     };
   };