public List<String> getList(ConfigKey key, List<String> fromConfig) {
        return stringListValueExtractor.getFromPreferredSource(prefix, key, fromConfig);
    }
Initiates ValueProvider which is to work with data from the given properties.

The PropertyMode controls which source(s) to consult, and in which order.

@param prefix Only look at properties with this prefix.
@param properties
@param propertyMode Which source to prioritize
src/main/java/io/fabric8/maven/docker/config/handler/property/ValueProvider.java