🚀 Jellyfin Packaging 2026-09-14T20:34 for Jellyfin 12.1

What's Changed

• Use master mirror for Docker builds by @joshuaboniface in #144
• add org project automation by @crobibero in #145
• Rework project management by @crobibero in #146
• Automatically roll milestone items to next milestone by @crobibero in #147

Full Changelog: v12.0-202609072105...v12.1-202609142034