New formatter: Ruby

backend/src/langs.ts

@@ -1500,6 +1500,7 @@ binding_irb = IRB::Irb.new(workspace)
 binding_irb.run(IRB.conf)
 `,
     run: "ruby main.rb",
+    format: "cat main.rb | rufo -x",
     pkg: {
       install: "gem install --user-install NAME",
       uninstall: "gem uninstall --user-install NAME",

scripts/docker-install-phase5.bash

@@ -92,6 +92,7 @@ pip3 install black
 npm install -g bs-platform
 
 # Ruby
+gem install rufo
 gem install solargraph
 
 # Rust