Here is the primary RSS feed for all Nextcloud Releases on Github

Continuing the discussion from Discussion - Developing an automatic notification (for app maintainers) of the upcoming major release:

Add this to your RSS feed and you’ll be automatically notified the second any new release is pushed out: point release, beta or release client.

Hope it helps.

I think this one is more reliable:

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Right on. Made into a wiki post and added both.