I put together a little tasks.json file for use with VS Code, it makes running the dragonruby samples a bit simpler because I'm lazy :)
You can add it to .vscode/tasks.json in the dragonruby folder and then open the Command Palette (Ctrl/Cmd + Shift + P), choose "Run task", and then choose your task :) Should work on macOS and Linux, not sure about Windows.
https://gist.github.com/connorshea/9c4a1bede810497957e3fec50949bd63 (gist because itch.io's code formatter doesn't like me)