home/packages: add script to update nixos with low cpu and disk prio

home/home_packages.nix

@@ -15,6 +15,11 @@ let
   chromium_stackfield = pkgs.writeShellScriptBin "chromium_stackfield" ''
     ${lib.getExe pkgs.ungoogled-chromium} --socket=wayland org.chromium.Chromium --app=https://stackfield.com/
   '';
+  nixy_switch = pkgs.writeShellScriptBin "nixy_switch" ''
+    ${pkgs.util-linux}/bin/ionice -c 3 -- \
+    ${pkgs.coreutils}/bin/nice -n 20 -- \
+    ${lib.getExe pkgs.nixos-rebuild} --flake ./#nixy switch
+  '';
   qcad = pkgs.writeShellScriptBin "qcad" ''
     QT_QPA_PLATFORM=xcb ${lib.getExe pkgs.qcad} $@
   '';
@@ -131,7 +136,6 @@ in
       screen
       seer
       sioyek
-      skypeforlinux
       slurp
       steam-run
       stm32cubemx
@@ -166,9 +170,10 @@ in
       chromium_discord
       chromium_stackfield
       chromium_teams
+      nixy_switch
+      qcad
       ssh_proxy
       wrap_sh
-      qcad
     ]
     ++ [
       inputs.swaysw.packages.${system}.swaysw