chore: Change cron schedule for ISO upload to monthly

[inffy]

No need to build these every week

[Copilot]

Pull request overview

Updates the GitHub Actions workflow schedule for building/uploading stable ISOs so it runs monthly instead of weekly, reducing unnecessary recurring builds.

Changes:

• Changed the schedule cron trigger from weekly (Wednesdays) to monthly (5th day of the month) at 03:00 UTC.

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[codacy-production]

Up to standards ✅

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[renner0e]

SGTM, maybe it would make sense to do this on the first monday of the month, so we get an old (6d) tested image instead or right after the stable images published of that week

[inffy]

SGTM, maybe it would make sense to do this on the first monday of the month, so we get an old (6d) tested image instead or right after the stable images published of that week

That would need some kind of check then in the beginning of the job. Don't think we can do that just with cron or can we?`

These would go to the testing bucket anyway first so I was thinking we could just do a quick test on VM that it works and then promote it? We can easily change the day to the first of the month

[renner0e]

SGTM, maybe it would make sense to do this on the first monday of the month, so we get an old (6d) tested image instead or right after the stable images published of that week

That would need some kind of check then in the beginning of the job. Don't think we can do that just with cron or can we?`

These would go to the testing bucket anyway first so I was thinking we could just do a quick test on VM that it works and then promote it? We can easily change the day to the first of the month

Yeah it's not super important anyway, but yeah definitely keep the manual promotion