Support seconds field in cron expression

[jackchenjc]

🚀 Feature Request

Relevant Package [REQUIRED]

This feature request is for support-cron-scheduler. ### Description [**REQUIRED**] A more modern cron expression should support "seconds" as 6th field. ### Describe the solution you'd like Check if the given cron expression have "seconds" field, and attach `0` if not. For example: ``` 0 * * * * * ``` ### Describe alternatives you've considered

Should take the timezone into consideration. For example:

CRON_TZ=Asia/Taipei 0 * * * * *

[jackchenjc]

Found that the gocron lib we used has crontab validation implemented already. With withSeconds set to true here allows users specify crontab with seconds field, or the lib will attach 0 automatically if it is not specified.

Closing this issue.