I am uploading a mkdocs site to Gitlab Pages with CI building and publication process.

Now I wish to use my own domain with SSL enabled with a Let's Encrypt certificate following this tutorial:
https://about.gitlab.com/2016/04/11/tutorial-securing-your-gitlab-pages-with-tls-and-letsencrypt/

But I need to create a fixed html page under .well-known/ folder to enable Let's Encrypt verify my domain, and I have not found how to do it with mkdocs. When I try to expose a .directory, a can't retrieve my index.html page:

My config in mkdocs.yml is:

static_templates:
    - .teste/index.html

It is possible to create a html page in a "hidden" directory with mkdocs?