Set initial root password by default
Set initial root password by default. Also, send it downstream to be used by end-to-end tests that use Omnibus images.
GitLab MR for using GITLAB_INITIAL_ROOT_PASSWORD
if set: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/58090
Related issue: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/843
Edited by George Koltsov