docs: def build_target(self, target: Target):
          """Invoke the builder function for a target."""
          builder = Plugin.builders[target.builder_name]
          if builder.func:
              logger.debug('About to invoke the {} builder function for {}',
                           target.builder_name, target.name)
              builder.func(self, target)
          else:
              logger.debug('Skipping {} builder function for target {} (no '
                           'function registered)', target.builder_name, target)