added docker option

nixosModules/options.nix

@@ -53,4 +53,10 @@
     default = [];
     description = "Additional Home Manager modules to import";
   };
+
+  options.docker = lib.mkOption {
+    type = lib.types.bool;
+    default = false;
+    description = "Whether to enable docker stuff";
+  };
 }