Update monolog configuration and extend logrotate for notifier logs

Revised `monolog.yaml` to add a new "notifier" channel, updated handlers, and adjusted log settings. Extended logrotate configuration to include rotation rules for notifier logs, ensuring proper log management.

templates/logrotate/chill

@@ -14,4 +14,13 @@
   compress
   missingok
   notifempty
-}
+}
+
+/var/log/apt/notifier-*.log {
+  su php-fpm php-fpm
+  rotate 800
+  daily
+  compress
+  missingok
+  notifempty
+}