Should be extended by subclasses to actually do stuff. By default
        this will copy `input` over every file in the `outputs` list.

def build(self, input_path, output_paths):
        """Should be extended by subclasses to actually do stuff. By default
        this will copy `input` over every file in the `outputs` list."""
        for output in output_paths:
            shutil.copy(input_path, output_paths)