These are very simple self-contained Bash scripts to download, configure and install Ruby from source along with Bundler on Debian-family or Redhat-family systems.
You can use this link to always point to the latest release: https://raw.githubusercontent.com/infertux/ruby-bootstrap/master/bootstrap_ruby_stable.sh
wget https://raw.githubusercontent.com/infertux/ruby-bootstrap/master/bootstrap_ruby_stable.sh && bash ./bootstrap_ruby_stable.sh
MIT