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Ruby can be automatically configured by Devbox via the built-in Ruby Plugin. This plugin will activate automatically when you install Ruby 2.7 using devbox add ruby.

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Adding Ruby to your shell​

Run devbox add [email protected] bundler, or add the following to your devbox.json 
    "packages": [        "[email protected]",        "bundler@latest"    ]
This will install Ruby 3.1 to your shell. You can find other installable versions of Ruby by running devbox search ruby. You can also view the available versions on Nixhub

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Ruby Plugin Support​

Devbox will automatically create the following configuration when you install Ruby with devbox add.

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Environment Variables​

These environment variables configure Gem to install your gems locally, and set your Gem Home to a local folder 
RUBY_CONFDIR={PROJECT_DIR}/.devbox/virtenv/ruby
GEMRC={PROJECT_DIR}/.devbox/virtenv/ruby/.gemrc
GEM_HOME={PROJECT_DIR}/.devbox/virtenv/ruby
PATH={PROJECT_DIR}/.devbox/virtenv/ruby/bin:$PATH

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Disabling the Ruby Plugin​

You can disable the Ruby plugin by running devbox add ruby --disable-plugin, or by setting the disable_plugin field in your devbox.json: 
{
  "packages": {
    "ruby": {
      "version": "3.1",
      "disable_plugin": true
    },
    "bundler": { "version": "latest" }
  }
}

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Bundler​

In case you are using bundler to install gems, bundler config file can still be used to pass configs and flags to install gems. .bundle/config file example: 
BUNDLE_BUILD__SASSC: "--disable-lto"
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