public List<CopySpec> getFiles() {
    return files;
  }
Constructor for use by jackson to populate this object.

@param name a unique name for this layer
@param files a list of {@link CopySpec} describing files to add to the layer
@param properties a {@link FilePropertiesSpec} that applies to all files in this layer
jib-cli/src/main/java/com/google/cloud/tools/jib/cli/buildfile/FileLayerSpec.java