Zammad PROD with Docker-Compose & Letsencrypt

Ok I’m trying my luck again with Docker-Compose.

I loaded the repo via git and starting the docker compose is not the hardest.
Where my problem lies is the settings.
under .examples are examples and here is my problem.
First of all in the .examples/proxy/docker-compose.proxy-example.yml I specify the HOST!

I would have to do that in “docker-compose.override.yml”
now add the following:

version: ‘2’
services:
zammad-nginx:
ports:
- “80:80”
environment:
- VIRTUAL_HOST = EXAMPLE.de

That should be it for the domain right?

now the LetsEncrypt certificate is missing!
Can I link these in the container that he gets these outside the Dockers and then binds it?