Feature Request

Provide default configuration file/settings.

Description of Problem:

Our images do not ship with any default configuration file/settings. While all of them require configuration like Gitlab OAuth application id etc that cannot be defaulted, we can provide configuration files that for example read values from environment variables etc.

This makes it easy for container orchestration systems to inject configuration as they see fit.

Potential Solutions:

Provide a default configuration file with sensible defaults where possible.
Where sensible defaults cannot be provided, consider using environment variables.