Redirect www to non-www on GitLab Pages (not self hosted)

How to Use GitLab
1

I’m trying to do a domain-level redirect for my pages deployment on GitLab.com.

.gitlab-ci.yml

pages:
  script:
    - …
    - cp gitlab-redirects ./public/_redirects

gitlab-redirects (_redirects):

https://www.mysite.com/* https://mysite.com/:splat 301

When I visit https://www.mysite.com/_redirects I get:

1 rule
rule 1: valid

In practice however, visiting https://www.mysite.com doesn’t redirect to https://mysite.com — the domain remains www as requested.

Any ideas what I might be doing wrong? Or am I misunderstanding the feature? Thanks!