sudo gitlab-rails console production

--------------------------------------------------------------------------------
 GitLab: 12.7.5 (b0fe37ef58e)
 GitLab Shell: 11.0.0
 PostgreSQL: 10.9
--------------------------------------------------------------------------------

u = User.where(id:1).first

u = User.where(username:'muslu').first

u.password = 'yeniparola'

u.password_confirmation = 'yeniparola'

u.save!