docs: def main():
      """Entrypoint for ``lander`` executable."""
      args = parse_args()
      config_logger(args)
      logger = structlog.get_logger(__name__)
  
      if args.show_version:
          # only print the version
          print_version()
          sys.exit(0)
  
      version = pkg_resources.get_distribution('lander').version
      logger.info('Lander version {0}'.format(version))
  
      config = Configuration(args=args)
  
      # disable any build confirmed to be a PR with Travis
      if config['is_travis_pull_request']:
          logger.info('Skipping build from PR.')
          sys.exit(0)
  
      lander = Lander(config)
      lander.build_site()
      logger.info('Build complete')
  
      if config['upload']:
          lander.upload_site()
          logger.info('Upload complete')
  
      logger.info('Lander complete')