It is your time and you can do whatever you want.
My guess is that both communities, debian and ruby, will advise against packaging it.
Installing Ruby versions not packaged in Debian
You can use the ruby-build package to install Ruby interpreters that are not available in Debian. Note, however, what's written in the package README.Debian file:
While ruby-build is a great tool to build Ruby versions that are not available via APT, you should still use the Debian-packaged versions of Ruby whenever possible since they are tested and supported by the Debian community.
Please do not report bugs you encounter while using your homebuilt Rubies to the Debian team; Rubies built by yourself are not supported.
Else there is: https://rvm.io/
for people who think they need the latest and greatest version
This way or that way you will want to get in contact with the Ruby Team:https://wiki.debian.org/Teams/Ruby
#debian-ruby channel on irc.debian.org
(you have been warned at the top of this post. iirc: the relation between the debian team and ruby is not the best).