Add release notifications

[lunny]

I suppose add a new notification when a new release published. All watched user could receive a release notification via UI or mail. This could be an option for user, default is true.

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[appleboy]

Nice feature.

[lunny]

Since #765 has moved to v1.2, let's move this one also.

[markg85]

+1 for this feature. I just had a need for this for another project on github and ended up using gitpunch.
You could choose to not add this and stay compatible with how the release rss looks so that gitpunch also works in gitea.

Still, would be nice if this would be a build-in feature to not rely on a external service for release notifications.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[stale]

This issue has been automatically closed because of inactivity. You can re-open it if needed.

[suatfk]

if still open can you assign it to me ?

[mrsdizzie]

Release notification added in #12463