ddev: ddev-router fails to become ready if two containers expose the same numbered internal port

Run a Diagnostic and Paste Link Here

https://gist.github.com/justafish/bc089ef9043796df9a382f85cc64971a

Describe the bug

• Followed these instructions and added a service that exposes the same ports
• Restarted ddev
• ddev-router hangs

  ...
  Container ddev-drainpipe-test-firefox  Started 
  Container ddev-router  Creating 
  Container ddev-router  Created 
  Container ddev-router  Starting 
  Container ddev-router  Started 
  Failed to restart drainpipe-test: ddev-router failed to become ready; debug with 'docker logs ddev-router'; logOutput=, err=health 
  check timed out: labels map[com.docker.compose.service:ddev-router] timed out without becoming healthy, status= 
  

❯ docker logs ddev-router
Using the local CA at "/root/.local/share/mkcert" ✨
The local CA is now installed in the system trust store! ⚡️

Using the local CA at "/root/.local/share/mkcert" ✨

Created a new certificate valid for the following names 📜
 - "*.ddev.local"
 - "*.ddev.site"
 - "127.0.0.1"
 - "localhost"
 - "ddev-router"
 - "ddev-router.ddev_default"

Reminder: X.509 wildcards only go one level deep, so this won't match a.b.ddev.local ℹ️

The certificate is at "/etc/nginx/certs/.crt" and the key at "/etc/nginx/certs/.key" ✅

Using the local CA at "/root/.local/share/mkcert" ✨

Created a new certificate valid for the following names 📜
 - "*.ddev.local"
 - "*.ddev.site"
 - "ddev-router"
 - "ddev-router.ddev_default"
 - "127.0.0.1"
 - "localhost"

Reminder: X.509 wildcards only go one level deep, so this won't match a.b.ddev.local ℹ️

The certificate is at "/etc/nginx/certs/master.crt" and the key at "/etc/nginx/certs/master.key" ✅

forego     | starting nginx.1 on port 5000
forego     | starting dockergen.1 on port 5100
dockergen.1 | 2022/03/04 16:04:23 Generated '/gen-cert-and-nginx-config.sh' from 6 containers
dockergen.1 | 2022/03/04 16:04:23 Running 'bash /gen-cert-and-nginx-config.sh'
dockergen.1 | 2022/03/04 16:04:23 [bash /gen-cert-and-nginx-config.sh]: Processing certs and nginx for hostnames: *.drainpipe-test.ddev.site drainpipe-test.ddev.site 
dockergen.1 | 2022/03/04 16:04:23 [bash /gen-cert-and-nginx-config.sh]:  - "*.drainpipe-test.ddev.site"
dockergen.1 | /03/04 16:04:23 Error running notify command: nginx -s reload, exit status 1
dockergen.1 | 2022/03/04 16:04:23 Watching docker events
dockergen.1 | 2022/03/04 16:04:24 Contents of /gen-cert-and-nginx-config.sh did not change. Skipping notification 'bash /gen-cert-and-nginx-config.sh'

To Reproduce

• Add .ddev/docker-compose.selenium.yaml

version: '3.6'

services:
  chrome:
    container_name: ddev-${DDEV_SITENAME}-chrome
    image: selenium/standalone-chrome:4.1.2-20220217
    labels:
      com.ddev.site-name: ${DDEV_SITENAME}
      com.ddev.approot: $DDEV_APPROOT
    expose:
      - 7900
    environment:
      - VIRTUAL_HOST=$DDEV_HOSTNAME
      - HTTPS_EXPOSE=7900:7900
      - HTTP_EXPOSE=7901:7900
    links:
      - web:web
      - web:drupal_chrome
    external_links:
      - ddev-router:${DDEV_SITENAME}.${DDEV_TLD}
    volumes:
      - ".:/mnt/ddev_config"

  firefox:
    container_name: ddev-${DDEV_SITENAME}-firefox
    image: selenium/standalone-firefox:4.1.2-20220217
    labels:
      com.ddev.site-name: ${DDEV_SITENAME}
      com.ddev.approot: $DDEV_APPROOT
    expose:
      - 7900
    environment:
      - VIRTUAL_HOST=$DDEV_HOSTNAME
      - HTTPS_EXPOSE=7902:7900
      - HTTP_EXPOSE=7903:7900
    links:
      - web:web
      - web:drupal_firefox
    external_links:
      - ddev-router:${DDEV_SITENAME}.${DDEV_TLD}
    volumes:
      - ".:/mnt/ddev_config"

• Run ddev restart

Expected behavior

Selenium front-end is available on http://drainpipe-test.ddev.site:7900, http://drainpipe-test.ddev.site:7902, http://drainpipe-test.ddev.site:7901, and http://drainpipe-test.ddev.site:7904

Version and configuration information (please complete the following information)

• ddev version v1.18.2
• Docker version 20.10.12, build e91ed57
• `Linux asterix 5.14.0-1024-oem #26-Ubuntu SMP Thu Feb 17 14:35:50 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
• config.yml`

name: drainpipe-test
type: drupal9
docroot: web
php_version: "7.4"
webserver_type: nginx-fpm
router_http_port: "80"
router_https_port: "443"
xdebug_enabled: false
additional_hostnames:
- '*.drainpipe-test'
additional_fqdns: []
mariadb_version: "10.4"
mysql_version: ""
nfs_mount_enabled: false
mutagen_enabled: false
hooks:
  post-start:
  - exec: mysql -uroot -proot -hdb -e "CREATE DATABASE IF NOT EXISTS firefox; GRANT ALL ON firefox.* TO 'db'@'%';"
  - exec: mysql -uroot -proot -hdb -e "CREATE DATABASE IF NOT EXISTS chrome; GRANT ALL ON chrome.* TO 'db'@'%';"
use_dns_when_possible: true
composer_version: "2"
web_environment:
  - NIGHTWATCH_DRUPAL_URL_FIREFOX=https://drupal_firefox
  - NIGHTWATCH_DRUPAL_URL_CHROME=https://drupal_chrome