Rockons: map configured env variable to multiple containers

[daniel-illi]

I'd like to be able to define an ENV variable for the configuration wizard that gets mapped to multiple containers included in the rockon. Additionally it should be possible to use a different env variable name for each container.

Example:
I'm writing a rockon which includes a web application container and a database container.

• The database container allows to set the db admin password by env variable POSTGRES_PASSWORD.
• The web app container includes setup scripts that allow to initialize the database table if I provide the db admin password by env variable DB_ENV_PASS.

→ In the config wizard I'd like to define the db admin password once and use it for both env variables of the different containers.