As lk-jwt-service is hosted in a bridge network, the previous
`extra_hosts` using 127.0.0.1 would just loop back to the container
itself. Using `network_mode: host` is unnecessary, and the
`host-gateway` approach works well for both Podman and Docker
Host loopback issues are prevalent in non-Livekit scenarios too: push
gateways is another example. Considering moving these to a dedicated
Docker section of the troubleshooting page.