writeShellApplication updates

modules/hosts/janus/default.nix

@@ -3,7 +3,7 @@ let
   username = "john";
   hostname = "janus";
   ca-url = "https://janus.john-stream.com/";
-  fingerprint = "2036c44f7b5901566ff7611ea6c927291ecc6d2dd00779c0eead70ec77fa10d6";
+  fingerprint = builtins.readFile ./fingerprint;
 in
 {
   flake.modules.nixos.janus-ca =
@@ -102,7 +102,7 @@ in
     };
   };
 
-  perSystem = { pkgs, lib, ... }: {
+  perSystem = { system, pkgs, lib, ... }: {
     packages.janus-ca = inputs.wrappers.lib.wrapPackage {
       inherit pkgs;
       package = pkgs.step-cli;