Add main program and update script

pkgs/by-name/ca/cato-client/package.nix

@@ -20,6 +20,16 @@ let
         sha256 = "sha256-0hUchaxaiKJth2ByQMFfjsCLi/4kl+SrNSQ33Y6r3WA=";
       };
 
+      passthru.updateScript = writeScript "update-cato-client" ''
+        #!/usr/bin/env nix-shell
+        #!nix-shell -i bash -p curl pcre2 common-updater-scripts
+
+        set -eu -o pipefail
+
+        version="$(curl -sI https://clientdownload.catonetworks.com/public/clients/cato-client-install.deb | grep -Fi 'Location:' | pcre2grep -o1 '/(([0-9]\.?)+)/')"
+        update-source-version cato-client "$version"
+      '';
+
       dontConfigure = true;
 
       nativeBuildInputs = [
@@ -55,6 +65,7 @@ let
       meta = {
         description = "Cato Client is a lightweight agent that provides secure zero-trust access to resources everywhere";
         homepage = "https://www.catonetworks.com/platform/cato-client/";
+        mainProgram = "cato-sdp";
         license = lib.licenses.unfree;
         maintainers = with maintainers; [ yarekt ];
         platforms = [ "x86_64-linux" ];