/usr/lib/ruby/vendor_ruby/ is in ruby-database-cleaner 1.3.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo/
/usr/lib/ruby/vendor_ruby/database_cleaner.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/
/usr/lib/ruby/vendor_ruby/database_cleaner/moped/
/usr/lib/ruby/vendor_ruby/database_cleaner/moped/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/moped/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/moped/truncation_base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/cucumber.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/configuration.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo_mapper/
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo_mapper/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo_mapper/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/active_record/
/usr/lib/ruby/vendor_ruby/database_cleaner/active_record/deletion.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/active_record/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/active_record/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/active_record/transaction.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/null_strategy.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/ohm/
/usr/lib/ruby/vendor_ruby/database_cleaner/ohm/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongo/truncation_mixin.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/generic/
/usr/lib/ruby/vendor_ruby/database_cleaner/generic/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/generic/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/generic/transaction.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/data_mapper/
/usr/lib/ruby/vendor_ruby/database_cleaner/data_mapper/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/data_mapper/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/data_mapper/transaction.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/sequel/
/usr/lib/ruby/vendor_ruby/database_cleaner/sequel/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/sequel/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/sequel/transaction.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/redis/
/usr/lib/ruby/vendor_ruby/database_cleaner/redis/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/redis/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/couch_potato/
/usr/lib/ruby/vendor_ruby/database_cleaner/couch_potato/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/couch_potato/truncation.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongoid/
/usr/lib/ruby/vendor_ruby/database_cleaner/mongoid/base.rb
/usr/lib/ruby/vendor_ruby/database_cleaner/mongoid/truncation.rb