public boolean isDataImage() {
        // If there is no explicit run configuration, its a data image
        // TODO: Probably add an explicit property so that a user can indicated whether it
        // is a data image or not on its own.
        return run == null;
    }
Override externalConfiguration when defined via special property.

@param externalConfiguration Map with alternative config
src/main/java/io/fabric8/maven/docker/config/ImageConfiguration.java