code: def get_valid_task_types():
      
      return frozendict({
          'scriptworker': verify_scriptworker_task,
          'balrog': verify_balrog_task,
          'beetmover': verify_beetmover_task,
          'bouncer': verify_bouncer_task,
          'build': verify_build_task,
          'l10n': verify_build_task,
          'repackage': verify_build_task,
          'action': verify_parent_task,
          'decision': verify_parent_task,
          'docker-image': verify_docker_image_task,
          'pushapk': verify_pushapk_task,
          'pushsnap': verify_pushsnap_task,
          'shipit': verify_shipit_task,
          'signing': verify_signing_task,
          'partials': verify_partials_task,
      })
docs: Get the valid task types, e.g. signing.
  
      No longer a constant, due to code ordering issues.
  
      Returns:
          frozendict: maps the valid task types (e.g., signing) to their validation functions.