https://medium.freecodecamp.org/how-to-add-an-ssl-certificate-and-custom-namecheap-domain-to-a-gitlab-pages-site-323f8f3ce642

Adding an SSL certificate and custom Namecheap domain to a GitLab Pages site can be a bit more challenging than it seems.

Crucial pieces of the setup information live in sometimes dense documentation across different sites. It can be hard to tell if you’ve set things up correctly given that you have to wait hours to confirm your changes have propagated.