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Starting in Rails 7.1, Docker files are added by default in new applications, but Docker has been popular for Rails development for many years before that. At FastRuby.io, we use the Dual-Boot technique when we work on upgrades, and using that approach when an application uses Docker requires some extra steps to keep a great development experience. Initial Setup We’ll use this initial basic setup as an example of the technique. Since applications can have Docker configured in completely differe...