Secret environment variable values lost

[moufmouf]

When running the aent-mysql, it generates a ".mysqldev.env" environement variable.
But the values of the env vars are lost and replaced with "value":

.mysqldev.env

# The password for the root user of MySQL
MYSQL_ROOT_PASSWORD=value
# The password of the default user, created on MySQL first startup
MYSQL_PASSWORD=value
# A default database, created on MySQL first startup
MYSQL_DATABASE=value
# A default user, created on MySQL first startup
MYSQL_USER=value