Add CI for Rails 7.2

[Earlopain]

Additionally, add an exclude for main since it bumped the ruby version

[Earlopain]

Test failures seem somewhat legit, however I can't tell if tests are doing something wrong. Nobody complained about it in a real application yet probably:

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  gem "activemodel", "~> 7.2.0"
  gem "railties", "~> 7.2.0"
  gem "activesupport", "~> 7.2.0"
end

require "rails"

module BlogApp
  class Application < Rails::Application; end
end
Rails.env = 'development'
app = BlogApp::Application.new
app.config.eager_load = true
app.initialize!
# /home/earlopain/.rbenv/versions/3.3.5/lib/ruby/gems/3.3.0/gems/railties-7.2.2/lib/rails/health_controller.rb:35:in `<module:Rails>': uninitialized constant ActionController::Base (NameError)
# 
#   class HealthController < ActionController::Base
#                                            ^^^^^^

Maybe because they are eager_autoloaded? rails/rails@b0b1eb5

[utkarsh2102]

@Earlopain, thanks for the patch, I wonder if it's safe to skip or ignore the above

uninitialized constant ActionController::Base (NameError)

error?

[Earlopain]

I would guess it is test-only since I don't think anyone has reported it, so probably safe to ignore.

Anyways, I'll close this. Rails 8.0 has already been released and I don't have the motivation to dig into this.