add verifier service

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

modules/update.nix

@@ -16,4 +16,19 @@
     persistent = true;
     flake = "git+ssh://nayeonie.com/ahuston-0/nix-dotfiles.git";
   };
+
+  services.nix-verify = {
+    daily = {
+      enable = true;
+      verify-contents = false;
+      verify-trust = false;
+    };
+    weekly = {
+      enable = true;
+      verify-contents = true;
+      verify-trust = false;
+      frequency = "1week";
+      randomized-delay-sec = "6hour";
+    };
+  };
 }