Why wasn't build/deploy not triggered for Pages, after pushing to the preview branch?

Hi,

We're using GitLab.
staging
branch is configured as preview branch for Pages.
A developer has merged and pushed the code into the
staging
branch, however the Pages build has not been triggered.
Before that, the builds were working as expected. This is the first time another developer has pushed into this branch.
Why wasn't the pipeline triggered?
Was this page helpful?