fix: directly expose port on 8036 when router disabled, fixes #3

[rfay]

The Issue

• No default port is bound, so hard to use on gitpod or codespaces #3

How This PR Solves The Issue

• When omit_containers[ddev-router] create a docker-compose.phpmyadmin-norouter.yaml which exposes container port 80 as localhost port 8036
• On removal of the add-on, also remove the new file

Manual Testing Instructions

With and without omit_containers: [ddev-router] try:

ddev get https://github.com/rfay/ddev-phpmyadmin/tarball/20230725_ports
ddev restart

This should work on Gitpod and Github Codespacees

Automated Testing Overview

• Needs test

Related Issue Link(s)

Release/Deployment Notes