docs: def _verify(self):
          """Some sanity checks on GPG."""
          if not self.keyid:
              raise ValueError('No GPG key specified for signing, did you mean to use --no-sign?')
          sign = self.gpg.sign('', keyid=self.keyid)
          if 'secret key not available' in sign.stderr:
              raise ValueError('Key not found')
          elif 'NEED_PASSPHRASE' in sign.stderr:
              self.passphrase = getpass.getpass('Passphrase for GPG key: ')