added keys so nodens can sign builds

nixos/roles/default.nix

@@ -34,10 +34,10 @@
   # right now it is only nodens so nodens can build system configs
   # and we can deploy them from nodens.
   # For security reasons we might want to move this to the vm part, as
-  # someone who can get controll of nodens and get hold of the build process
+  # someone who can get control of nodens and get hold of the build process
   # can gain control of the other machines. While this is very handy
   # and a step towards CI, we might not want this for backups.
-  # (This is a tradeof between security and convinience)
+  # (This is a tradeof between security and convenience)
   nix.settings.trusted-public-keys = ["nodens-deploy.key:VHJmEr17pdoEEnWlSfC03TIf4GBbClxGRiInHuWaUvU="];
 
   environment = {