sitemap.xml not created automatically

[giswqs]

The MyST User Guide says that The sitemap.xml is always created and is accessible through [sitemap.xml](https://mystmd.org/sitemap.xml).

However, I could not find the sitemap.xml for my site.

• Repo: https://github.com/giswqs/myst-demo
• GitHub Pages: https://giswqs.github.io/myst-demo

Sitemap link (not working) https://giswqs.github.io/myst-demo/sitemap.xml

Artifact from GitHub Pages