Merge pull request rails#51789 from Shopify/reference-devcontainer-guides-in-dockerfile

Reference the dev container guides in a comment in the production doc…

Author: rafaelfranca

railties/lib/rails/generators/rails/app/templates/Dockerfile.tt

@@ -4,6 +4,8 @@
 # docker build -t my-app .
 # docker run -d -p 80:80 -p 443:443 --name my-app -e RAILS_MASTER_KEY=<value from config/master.key> my-app
 
+# For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html
+
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
 ARG RUBY_VERSION=<%= gem_ruby_version %>
 FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base