« … With Ruby Infrastructure. » Ruby isn’t doing the compute. Instead, Ruby is used to distribute and run workloads on individual machines. The underlying project is Peplum: https://rubygems.org/gems/peplum/versions/0.3.3
Ruby 3.2 comes with YJIT which is a new JIT compiler Ruby totally rewritten in rust. Also native Ruby extensions can now be written in rust in addition to C. So the ecosystem here lets you write C, Rust or Ruby.