expand check to match Rails generated Dockerfiles

[rubys]

An example:

ARG RUBY_VERSION=3.4.2
FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base

[albus522]

Approving with possible suggestion

[albus522]

Maybe?

Suggested change

	matching_image = /FROM .*ruby:.+-(alpine|slim)/i.match?(dockerfile)
	matching_image = /FROM .*\/ruby:.+-(alpine|slim)/i.match?(dockerfile)

[albus522]

That suggestion is wrong

[albus522]

Suggested change

	matching_image = /FROM .*ruby:.+-(alpine|slim)/i.match?(dockerfile)
	# https://rubular.com/r/Jb4LEfrMSmxkp9
	matching_image = /FROM (.*\/)?ruby:(.+-)?(alpine|slim)/i.match?(dockerfile)

[rubys]

This should do the trick:

@@ -418,7 +418,7 @@ class DockerfileGenerator < Rails::Generators::Base
       # Older versions no longer release new images
       matching_ruby = [">= 3.4.2", "~> 3.3.7", "~> 3.2.7", "~> 3.1.7"].any? { |v| Gem::Requirement.new(v).satisfied_by?(Gem.ruby_version) }
       # Only slim and alpine are missing libyaml-dev/yaml-dev
-      matching_image = /FROM .*ruby:.+-(alpine|slim)/i.match?(dockerfile)
+      matching_image = /FROM (|.+/)ruby:.+-(alpine|slim)/i.match?(dockerfile)

[albus522]

Did you notice my updated suggestion with test cases?