dockerで構築したgitlabのrootパスワードを確認する

$ docker ps

CONTAINER ID   IMAGE
xxxxxxxxx   gitlab/gitlab-ce:14.9.2-ce.0 

$ docker container exec -it xxxxxxxxx bash

cat /etc/gitlab/initial_root_password

# WARNING: This value is valid only in the following conditions
#          1. If provided manually (either via `GITLAB_ROOT_PASSWORD` environment variable or via `gitlab_rails['initial_root_password']` setting in `gitlab.rb`, it was provided before database was seeded for the first time (usually, the first reconfigure run).
#          2. Password hasn't been changed manually, either via UI or via command line.
#
#          If the password shown here doesn't work, you must reset the admin password following https://docs.gitlab.com/ee/security/reset_user_password.html#reset-your-root-password.

Password: xxxxxxxxxxxxxxxxxx

# NOTE: This file will be automatically deleted in the first reconfigure run after 24 hours.

$ sudo docker exec -it xxxxxxxxx grep 'Password:' /etc/gitlab/initial_root_password