SELinux should not be an issue if you stick to common directories and use :Z flag after the mount path with docker, afaik podman uses the same mechanism. There’s even a tool for selinux container policies: https://github.com/containers/udica
Regarding firewall stuff, disable it on your machine and you are fine. Port forwarding in containers is necessary to connect to services, now way around.
Ah and read this: https://stopdisablingselinux.com/
It has a reason why it exists.
I don’t but lots of people stick anyways to a single network with some kind of crappy router and from OPs post I assumed that OP doesn’t really care about security, see SELinux