Description
I've followed #30617 (and symfony/symfony-docs#13571) for configuring support for locales based on host. Unfortunately, it does not support for env variables for hosts and in my opinion it makes this feature unusable, non-friendly at least:

• routes must be defined differently for DEV and PROD
• moving app between domains requires changes in codebase

Would be great if hosts could be passed as env variables.

Example

foo:
    resource: routes/foo.yaml
    prefix: /
    defaults:
        _format: html
    host:
        en: '%env(APP_HTTP_HOST)'
        pl: '%env(APP_HTTP_HOST_PL)'

With config above it does not work, even considering #38209 is fixed and host-related rules are checked.

CC: @odolbeau