Improved support for the share command in docker

[Thomas-MultiSafepay]

We often use expose directly from our development containers to share publicly.
This pull request will simplify this with support for the following setup:

version: '3.8'
services:
app:
image: php:8.0-apache
volumes:
- ./:/var/www/html/
expose:
image: beyondcodegmbh/expose-server:latest
command: "share app --subdomain=${APP_SUBDOMAIN}"
ports:
- 4040:4040
environment:
token: ${EXPOSE_TOKEN}