docs: update documentation for automated package updates workflow

docs/guides/adding-packages.md

@@ -18,6 +18,17 @@ nix flake init -t .#package my-new-package
 
 This creates a template structure in `templates/package/` that you can copy.
 
+### Automatic Updates
+
+**Important**: This repository uses automated package updates via Gitea Actions and `nix-update`. When adding a new package:
+
+- Use any stable, working version for the initial package
+- You don't need to use the absolute latest version
+- The automation will keep the package updated automatically on a weekly basis
+- Review and merge automated update PRs as they come in
+
+See the main README.md for more details on the automated update workflow.
+
 ### Manual Setup
 
 1. Create directory: `pkgs/your-package/`