The appcast Lukotta checks for updates, served at https://lukotta-updates.rahula.dev/appcast.xml.
It holds the feed and the release notes each entry links to, and nothing else. The archives themselves are attached to the releases in the app’s own repository. A separate repository because one GitHub Pages site serves one custom domain, and that one belongs to the project’s website.
Written by scripts/release.sh in the app’s repository; committed here.