Following D4102 and D4103, these values get passed into the Docker container via environmental variables. We should avoid any confusion here, and avoid accidentally leaking any secrets.

Create a keyserver/.env file, eg.:

COMM_MYSQL_DATABASE=commdev
COMM_MYSQL_USER=commdev
COMM_MYSQL_PASSWORD=pass

And then make sure the Docker image still works: docker-compose down -v && docker-compose up --build