Add support for WP_ENVIRONMENT_TYPE

[pfefferle]

WordPress does support environment types since version 5.5 https://developer.wordpress.org/reference/functions/wp_get_environment_type/

It would be nice to add support for WP_ENVIRONMENT_TYPE as environment variable.

[pfefferle]

It is already possible using:

version: '3'
services:
  wordpress:
    image: wordpress:latest
    environment:
      WP_ENVIRONMENT_TYPE: development

:)