Note dockerfile-rails gem requirement in Rails Dockerfiles guide#2421
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Running 'bin/rails generate dockerfile' on an older Rails app that predates the dockerfile-rails gem fails with 'Could not find generator dockerfile'. Add a callout pointing users to add the gem first. Supersedes #1184.
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Running
bin/rails generate dockerfileon an older Rails app that predates thedockerfile-railsgem fails withCould not find generator 'dockerfile'., with no guidance in the docs. This adds a callout in the Updates section pointing users to add the gem first.Supersedes #1184 (same idea; this version fixes a typo, links the canonical
rubys/dockerfile-railsrepo to match the rest of the page, and uses the standard callout markup).