We must be able to easily define the container configuration using yaml file or .env file (supported by docker compose)
Possible parameters:
- PHP version (7.0/5.6)
- Drupal version (dev, 8, 8.2.6 etc) (composer?)
- Modules to be installed as well as modules versions (composer?)
Configuration could splitted, for example .env file to define PHP version, config.yml for drupal/modules etc.