fix(schedules): determine trigger off current UTC time

cmd/vela-server/schedule.go

@@ -49,34 +49,16 @@ func processSchedules(compiler compiler.Engine, database database.Interface, met
 			continue
 		}
 
-		// create a variable to track if a build should be triggered based off the schedule
-		trigger := false
+		gron := gronx.New()
 
-		// parse the previous occurrence of the entry for the schedule
-		prevTime, err := gronx.PrevTick(schedule.GetEntry(), true)
+		// determine if a build should be triggered based off the schedule
+		trigger, err := gron.IsDue(schedule.GetEntry(), time.Now().UTC())
 		if err != nil {
 			logrus.WithError(err).Warnf("%s for %s", baseErr, schedule.GetName())
 
 			continue
 		}
 
-		// parse the next occurrence of the entry for the schedule
-		nextTime, err := gronx.NextTick(schedule.GetEntry(), true)
-		if err != nil {
-			logrus.WithError(err).Warnf("%s for %s", baseErr, schedule.GetName())
-
-			continue
-		}
-
-		// parse the UNIX timestamp from when the last build was triggered for the schedule
-		t := time.Unix(schedule.GetScheduledAt(), 0).UTC()
-
-		// check if the time since the last triggered build is greater than the entry duration for the schedule
-		if time.Since(t) > nextTime.Sub(prevTime) {
-			// trigger a build for the schedule since it has not previously ran
-			trigger = true
-		}
-
 		if trigger && schedule.GetActive() {
 			err = processSchedule(schedule, compiler, database, metadata, queue, scm)
 			if err != nil {