Ref: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/492#note_1902569
# Edit at /opt/gitlab/embedded/service/gitlab-rails/app/assets/
$ apt-get install acl
$ setfacl -R -m u:git:rwX /opt/gitlab/embedded/service/gitlab-rails/public/assets/
$ gitlab-rake assets:clean RAILS_ENV=production
$ gitlab-rake assets:precompile RAILS_ENV=production
$ chmod -R a+rX /opt/gitlab/embedded/service/gitlab-rails/public/assets/
$ setfacl -R -x u:git /opt/gitlab/embedded/service/gitlab-rails/public/assets/