Fix cron expression in Calendar Sync Cron Job to trigger every 15 minutes

steps/advoware_cal_sync/calendar_sync_cron_step.py

@@ -17,7 +17,7 @@ config = {
     'description': 'Runs calendar sync automatically every 15 minutes',
     'flows': ['advoware-calendar-sync'],
     'triggers': [
-        cron("0 */15 * * * *")  # Every 15 minutes (6-field: sec min hour day month weekday)
+        cron("*/15 * * * * *")  # Every 15 minutes at second 0 (6-field: sec min hour day month weekday)
     ],
     'enqueues': ['calendar_sync_all']
 }