Bake a ``gilt`` command so it's ready to execute and returns None.

        :return: None

def bake(self):
        """
        Bake a ``gilt`` command so it's ready to execute and returns None.

        :return: None
        """
        self._sh_command = getattr(sh, self.command)
        self._sh_command = self._sh_command.bake(
            self.options,
            'overlay',
            _env=self.env,
            _out=LOG.out,
            _err=LOG.error)