don't garbage collect direnv flakes

not really a big problem, but worth adding just in case

modules/common/shell/direnv.nix

@@ -6,4 +6,10 @@
     config = { whitelist = { prefix = [ config.dotfilesPath ]; }; };
   };
 
+  # Prevent garbage collection
+  nix.extraOptions = ''
+    keep-outputs = true
+    keep-derivations = true
+  '';
+
 }

modules/nixos/hardware/boot.nix

@@ -13,6 +13,9 @@
       # Attempt to display GRUB on widescreen monitor
       gfxmodeEfi = "1920x1080";
 
+      # Limit the total number of configurations to rollback
+      configurationLimit = 25;
+
       # Install GRUB onto the boot disk
       # device = config.fileSystems."/boot".device;