do
Execute block once at the KronScheduler.next time and return result of block calculation.
WARNING!!! If you want to launch it in parallel, you must do this explicitly.
WARNING!!! In case if KronScheduler.next of this instance will return null, block will be called immediately
inline suspend fun <T> doOnce(scheduleConfig: String, block: (<Error class: unknown class>) -> T): T(source)
Will buildSchedule using scheduleConfig and call doOnce on it