Adding Ruby dependencies (gems) is pretty trivial. And the Ruby package manager (bundler) only installs the new dependency if you do it on your own machine. In

Adding Ruby dependencies (gems) is pretty trivial. And the Ruby package manager (bundler) only installs the new dependency if you do it on your own machine. In Docker it will do all of them. It's worth noting that bundle uses a Gemfile, so it's not installing each Gem as a seperate step.