Dynamic values in configuration

If you set the value dynamic_values: true in your common.yaml, you can use ERb syntax in your configuration values. For example, if you want to dynamically specify the location of a file from an environment variable, you could enable the environment plugin and do something like this:

data_sources: [ 'file' , 'environment' ]
template_sources: [ 'file' ]
dynamic_values: true
            target: <%= env_target %>

And then pass the target environment variable at run-time. You can also call helper modules to populate values as well.