mkdir gitlab
git clone --recurse-submodules https://gitlab.com/gitlab-org/gitlab .
git fetch --all --prune
git checkout -- Gemfile.lock db/structure.sql locale
git checkout v15.4.0
bundle config set --local deployment 'true'
bundle config set --local without 'development test mysql aws kerberos'
bundle config build.gpgme --use-system-libraries
bundle install --jobs=16 --no-cache
bundle clean
cp config/gitlab.yml.example config/gitlab.yml
cp config/database.yml.postgresql config/database.yml
bundle exec rake db:migrate RAILS_ENV=production