Add the possibility to substitute or interpolate environment/magnolia properties. Specify placeholders in yaml definitions/decorations which will be parsed before loading them, so developers can refer to variables specified in e.g. magnolia.properties or environment variables. Configuration per environment/profile is very common and used in frameworks like spring.

Use case:
A rest-client definition has the same yaml definition, but only the baseUrl or a timeout setting is different.

Example configuration:

database:
  host: ${DB_HOST:-localhost}
  user: ${DB_USER:-defaultuser}
  password: ${DB_PASSWORD}

The DB_HOST will be replaced using the MagnoliaConfiguration class which will lookup the value from the layers of property sources (magnolia.properties, environment variables, etc..)

Workaround
Different configurations possible for different environments