Only deploy when there are releases in last 8 hours

[sverhoeven]

The deploy workflow runs every 8 hours, see https://github.com/jasp-stats-modules/modules-app/blob/main/.github/workflows/deploy.yml#L9

This could lead to web app builds and deployments without any changes.

We could add check to scraper that when there are no new releases made in last 8 hours then the rest of the workflow is skipped.

We should make the 8 hours configurable.

We should only skip when job was triggered by the scheduled cron.

[sverhoeven]

The number of downloads would also be not updated when a deployment is skipped, is that OK?