feat: add fprintd signin and enabled in kokoro system config

modules/nixos/hardware/fingerprint/default.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  lib,
+  namespace,
+  ...
+}: let
+  inherit (lib) mkIf mkEnableOption;
+  inherit (lib.${namespace}) getAttrByNamespace mkOptionsWithNamespace;
+  base = "${namespace}.hardware.fingerprint";
+  cfg = getAttrByNamespace config base;
+in {
+  options = mkOptionsWithNamespace base {
+    enable = mkEnableOption "fingerprint signins";
+  };
+
+  config = mkIf cfg.enable {
+    services.fprintd = {
+      enable = true;
+    };
+
+    ${namespace}.services.storage.impermanence.folders = ["/var/lib/fprint"];
+  };
+}

systems/x86_64-linux/kokoro/default.nix

@@ -24,6 +24,7 @@ in {
 
     hardware = {
       battery = enabled;
+      fingerprint = enabled;
       xremap = enabled;
     };