Add bundler version as explicit Ruby dependency
Update to latest Bundler, and follow the principles at: https://bundler.io/blog/2022/01/23/bundler-v2-3.html.
This MR should allow us to:
- Update to latest versions of RubyGems and Bundler whenever we build images that have Ruby.
- If newer versions of Bundler become available, using the new version of v2.3, running
bundle update --bundler
should make sure we're always running the version set in the lock file.
Edited by Evan Read