Hi.
There are severals ways for accomñish this tas, for exaple usig a proxy web, using iptables or chanign internal odoo port into docker config
I can help you without problem, just I need access to server for do it. If you can gove me access, I can provide you with instruction for do it, just I need: operating system and exact version used, odoo docker version used.
I've worked with linux, odoo from long time ago.
Open to questions.