[Feature]: Be able to set HOST to other value, like "0.0.0.0", when running app extension.

[dalexhd]

What area(s) will this request affect?

Extension

What type of change do you want to see?

New feature

Overview

Currently, my development workflow relies on a dockerized environment. That means that I need to bind all running containers to the 0.0.0.0 host.
For some reason, Remix setup allows changing this host on the shopify.web.toml config, but there is no way of specifying it into the 'shopify.app.toml' config.

Motivation

I'm not able to develop extension apps within a dockerized environment.