How to use gems not in a Gemfile when working with bundler?

Question

When using bundler with a project in general and Rails specifically, you have access only to gems defined in your Gemfile. While this makes sense, it can be limiting. Mostly

Answer 1

I believe the gem Devpack provides the functionality you are looking for.

The gem allows you to add a single gem to your Gemfile which will permit any developer to configure their own preferred set of development gems either for an individual project or globally by creating a .devpack file containing a list of gems.

(I am the author of this gem; I came across this post while developing it so thought it may be worth adding).