ci: check download links daily

[dsanders11]

We've broken the download links on the website a few times and not noticed, so let's add some lightweight automation to confirm the links aren't 404ing after a new release.

Refs:

• AppImage x64 version links not working website#467
• Broken Darwin downloads #1503
• Release links broken on electronjs.org #1539

[coveralls]

coverage: 87.213%. remained the same
when pulling 56ba01b on check-download-links
into 8d0b8c2 on main.

[erickzhao]

The site is currently built on a cron if no new commits come in, so Fiddle download links get updated periodically instead of immediately on publish.

To make this work, I think we would need to dispatch https://github.com/electron/electron-website-updater events for Fiddle builds in the same way that we trigger commits every time the e/e docs update.

[dsanders11]

Good catch, I'd forgotten the links won't update on the website immediately.

To make this work, I think we would need to dispatch https://github.com/electron/electron-website-updater events for Fiddle builds in the same way that we trigger commits every time the e/e docs update.

There'd still be an indeterminate delay after the release was published before that website build would finish and go live, which risks the check not reviewing the latest state, which could provide a false negative.

How about for simplicity we just put this on a cron as well (say 1 AM PT)? That would catch broken download links faster than we currently do.

[erickzhao]

SGTM