master branch 'make check' broken by 'dashboard-frontend-unittest'

Hi all, We have this issue identified (https://tracker.ceph.com/issues/48441) and have a fix under CI testing (https://github.com/ceph/ceph/pull/38409). It only affects the 'master' branch. Issue analysis: - This PR (https://github.com/ceph/ceph/pull/37198) passed CI in Oct. 22. - This other PR (https://github.com/ceph/ceph/pull/37918) was merged later (Nov. 12). That one brought breaking changes to the previous. - The first PR was merged today. Ideas to avoid future issues like this: - Retrigger CI on CI-passing PRs without recent activity - Run master through CI for every PR merged (post-merge hook) Sorry for the inconvenience! Kind regards, Ernesto