v2: Support for .env files

[RecuencoJones]

In v1 .env files were supported through -envfile switch, will this be ported on to v2?

I have been able to workaround this by using set -a before sourcing the env file, and there are also tools that enable this like ruby's dotenv, npm's dotenv-cli or godotenv

Reference links:

• Original v1 issue: Load environment variables from a .env file #1941
• https://caddy.community/t/caddy-v2-environment-variables/6736