`*.gitlab.io` certificate does not work on pages for users that have `.` in the username
Summary
Currently my user name is shu.z. Perfectly legal, right. However the certificate for *.gitlab.io is not valid at shu.z.gitlab.io.
Steps to reproduce
Create a user name with . and publish pages.
Example Project
Currently this would be shu.z.gitlab.io but I will shortly change my username so I can publish pages.
What is the current bug behavior?
Self evident, I feel.
What is the expected correct behavior?
Relevant logs and/or screenshots
Output of checks
This bug happens on GitLab.com