bert: Implement natural sort for Caddy browse template

This can go away if upstream decides to implement/merge a fix:

https://github.com/caddyserver/caddy/issues/7226

This is mostly useful for the Newsletter downloads page:

https://stjohnscccc.org/downloads/Newsletters/

Requested-By: Mom

bert/configuration.nix

@@ -14,6 +14,14 @@
       ./services/owntracks-recorder.nix
     ];
 
+  nixpkgs.overlays = [
+    (self: super: {
+      caddy = super.caddy.overrideAttrs (oldAttrs: {
+        patches = (oldAttrs.patches or []) ++ [ ./caddy-natural-sort.patch ];
+      });
+    })
+  ];
+
   # Bootloader
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;