Pages pipeline not visible in CI/CD Pipelines

I’m at the very start of trying to use GitLab Pages. I have a .gitlab-ci.yml file with a pages (pipeline?) section: https://gitlab.gnome.org/GNOME/glom/blob/add-gitlab-pages/.gitlab-ci.yml

but that pipeline isn’t showing up in the CI/CD Pipelines::https://gitlab.gnome.org/GNOME/glom/pipelines

so I can’t “click run pipeline” as suggested here: https://docs.gitlab.com/ee/user/project/pages/index.html#getting-started

Am I missing something obvious? Is this not working just because it’s not in the master branch yet?