/usr/share/doc/ruby-rails/changelog.Debian.gz is in ruby-rails 2:4.2.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ruby-rails/../ruby-activesupport/changelog.Debian.gz
/usr/share/doc/ruby-rails/../ruby-activesupport/changelog.Debian.gz