Fix asterisk not loading res_geolocation

See https://github.com/NixOS/nixpkgs/issues/208165

machines/raven/services/asterisk.nix

@@ -1,5 +1,6 @@
 { config, lib, ... }:
 let
+  cfg = config.services.asterisk;
   secretConfigFiles = [
     "ari"
     "pjsip"
@@ -117,6 +118,12 @@ in
     useTheseDefaultConfFiles = [ ];
   };
 
+  system.activationScripts.copyAsteriskFiles = lib.stringAfter [ "var" ] ''
+    rm -f /var/lib/asterisk/documentation/core-en_US.xml
+    mkdir -p /var/lib/asterisk/documentation
+    ln -s ${cfg.package}/var/lib/asterisk/static-http/core-en_US.xml /var/lib/asterisk/documentation/core-en_US.xml
+  '';
+
   sops.secrets = (lib.listToAttrs (map
     (name: lib.nameValuePair "asterisk-${name}" {
       sopsFile = ../secrets.yaml;