Since the support for the bare-metal installation is ending, I switched to the dockerized setup. Works fine for me: the only issue is that I have some long-running rss-feeds which can take up to a minute to deliver any results. To mitigate this I ususally just adapted the values in /include/functions.php. I assume this is now bad practice for the docker setup. Any suggestion how this can be done properly?

add your customized stuff into config.d as a php file, it will be sourced into config.php