[Recipes] Fix base recipes not included in images (#9264)

Fix base recipes not included in images

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lloyd-brown

sky/setup_files/MANIFEST.in

@@ -22,6 +22,7 @@ include sky/users/*.conf
 include sky/utils/*.sh
 include sky/setup_files/alembic.ini
 recursive-include sky/schemas/db *
+recursive-include sky/recipes/examples *.yaml
 
 # SkyPilot templates package
 recursive-include sky_templates/ray *