feat: add nvd output to deploy

pkgs/deploy.nix

@@ -101,8 +101,12 @@
       for host in "''${HOSTS[@]}"; do
         store_path="''${TOPLEVEL_STORE_PATHS["$host"]}"
         echo "    Applying ⚙️ $host"
+        prev_system=$(ssh "$host" -- readlink /nix/var/nix/profiles/system)
         ssh "$host" -- /run/current-system/sw/bin/nix-env --profile /nix/var/nix/profiles/system --set "$store_path"
         ssh "$host" -- "$store_path"/bin/switch-to-configuration "$ACTION"
+        if [[ -n "$prev_system" ]]; then
+          ssh "$host" -- nvd diff "$prev_system" "$store_path"
+        fi
         time_next
         echo "     Applied ✅ $host in ''${T_LAST}s"
       done

users/modules/config/utils.nix

@@ -15,6 +15,7 @@ lib.optionalAttrs (!minimal) {
       killall
       ncdu
       neofetch
+      nvd
       rage
       rclone
       ripgrep