private static Path findNearestLocalConfig() {
		return Util.findNearestWith(null, Configuration.JBANG_CONFIG_PROPS, p -> p);
	}
Will either return the path to the given config or search for the nearest
config starting from cwd.

@param config The config to return or null to return the nearest config
@return Path to a config
src/main/java/dev/jbang/util/ConfigUtil.java