Add an aside callout about dockerfile-rails gem #1184
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Summary of changes
Add a notice about dockerfile-rails gem
Related Fly.io community and GitHub links
Update the
Update
section here: https://fly.io/docs/rails/getting-started/dockerfiles/#updatesNotes
If you have a Rails app that was created a while ago, you may not have dockerfile-rails gem in your Gemfile, so this command will not work! :-D