Share MySQL credentials with Docker Containers

[kducharm]

With the switch to Docker Compose v2, environment variables are no longer shared between containers. To allow dkan_starter to use credentials, switched to use an environment file and including it in web/cli containers configuration.

• Bring up site:

git clone git@github.com:NuCivic/dkan.git
cd dkan
bash dkan-init.sh dkan
export AHOY_CMD_PROXY=DOCKER # (can be put in bashrc)
ahoy docker up
ahoy docker exec ahoy dkan drupal-rebuild mysql://drupal:123@db/drupal
ahoy docker exec ahoy dkan remake
ahoy docker exec ahoy dkan reinstall

• Ensure MYSQL_* variables are available:
  ahoy docker exec env | grep MYSQL_
ahoy docker exec web env | grep MYSQL_