Create net network: docker network create net
To run others containers behind this proxy use: --net net or networks: ["net"](docker-compose) and VIRTUAL_HOST for proxy and LETSENCRYPT_HOST for ssl as you sub.domain.com
To debug mode set env var in letsencrypt:
environment:
- DEFAULT_EMAIL
- ACME_CA_URI=https://acme-staging-v02.api.letsencrypt.org/directory
https://hub.docker.com/r/jrcs/letsencrypt-nginx-proxy-companion
https://registry.hub.docker.com/r/jwilder/nginx-proxy#!
https://github.com/nginx-proxy/acme-companion/blob/main/docs/Zero-SSL.md