/usr/ is in ruby-grack 2.0.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/grack/
/usr/lib/ruby/vendor_ruby/grack/git.rb
/usr/lib/ruby/vendor_ruby/grack/server.rb
/usr/lib/ruby/vendor_ruby/grack/bundle.rb
/usr/lib/ruby/vendor_ruby/grack/auth.rb
/usr/lib/ruby/vendor_ruby/grack/version.rb
/usr/lib/ruby/vendor_ruby/grack.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/gitlab-grack-2.0.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-grack/
/usr/share/doc/ruby-grack/examples/
/usr/share/doc/ruby-grack/examples/dispatch.fcgi
/usr/share/doc/ruby-grack/copyright
/usr/share/doc/ruby-grack/changelog.Debian.gz
/usr/share/doc/ruby-grack/README.md