Optimisations

- Remove gpg from system-wide settings (we have it in home manager too).
- Try different gc settings.

bin/gc.bash

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+nix-collect-garbage -d
+sudo rm /nix/var/nix/gcroots/auto/*
+nix-store --gc

system/shared/shared-configuration.nix

@@ -42,21 +42,18 @@
   nix = {
     extraOptions = "experimental-features = nix-command flakes";
     package = pkgs.nixFlakes;
+    settings = {
+      auto-optimise-store = true;
+    };
     gc = {
       automatic = true;
       dates = "weekly";
-      options  = "--delete-older-than 30d";
+      options  = "--delete-older-than 7d";
     };
   };
 
   hardware.bluetooth.enable = true;
 
-  programs.gnupg.agent = {
-    enable = true;
-    enableSSHSupport = true;
-    pinentryFlavor = "curses";
-  };
-
   nixpkgs.config.allowUnfree = true;
 
   services.openssh = {