Submit a subtask to the runner.
This function is intended to be used in tasks.
Parameters
Options
Set dependencies for the task
default:"cluster of the runner"
Set the cluster slug of the cluster where the task will be executed.
Set the maximum number of retries for the subtask in case it fails
Mark the subtask as optional. An optional subtask will not fail the job if it fails. Tasks that depend on it will still execute even if it failed.
Returns
A future task that can be used to set dependencies between tasks.