Add support for Gemfile.local
From the original MR: !50334 (closed):
Add support for a Gemfile.local to allow developers to specify gems for inclusion in the bundle without having to modify Gemfile directly. The use case for this might be
* custom formatters for rspec
* console customization
* personal go-to debugging tools
* reducing friction for trialing gems across multiple branches
@kerrizor brought up the possibility of using the little known Bundler plugin architecture to build this in.
Edited by Gary Holtz