hi @Stinkywar welcome to the community 
you can see in multiple places… e.g. your config.php shows 28.0.4.1. docker :latest tag does not mean anything… today this could be one tomorrow completely different. in genral I recommend to avoid using the :latest for this reasons well explained here: What's Wrong With The Docker :latest Tag? · vsupalov.com
Your config looks right at first glance but I think you don’t need
usually this setting is not required. If removing the setting doesn’t help double check your networking. Chances exist connection is using other IPs than you configure (docker proxy network). You can check Apache logs (in case you are running Apache image) using docker logs ${container name} - double check from which IP you requests come to the system… likely you will see docker internal network segment like 172.16.x.x (borrow some hints from Apache Docker behind reverse proxy