Once a day the server asks Gitea or GitHub, as picked under Settings ->
Updates, for the latest release. A newer one shows as a pill in the
sidebar, a banner on the Dashboard and in the Updates card with its
release notes and the commands to update this server. Drafts and
pre-releases are ignored, nothing about the server is sent, and the check
can be switched off. POST /updates/check checks now.
Daniel Redetzke