Add Rails 8 example app (#2512) #3688

Job	Run time
Ruby 2.7 & Sidekiq 5.0, options - null	40s
Ruby 3.0 & Sidekiq 5.0, options - null	51s
Ruby 3.1 & Sidekiq 5.0, options - null	53s
Ruby 3.2 & Sidekiq 5.0, options - null	51s
Ruby 3.3 & Sidekiq 5.0, options - null	1m 0s
Ruby 3.4 & Sidekiq 5.0, options - null	58s
Ruby jruby & Sidekiq 5.0, options - null	1m 20s
Ruby 2.7 & Sidekiq 6.5, options - null	41s
Ruby 3.0 & Sidekiq 6.5, options - null	52s
Ruby 3.1 & Sidekiq 6.5, options - null	52s
Ruby 3.2 & Sidekiq 6.5, options - null	1m 0s
Ruby 3.3 & Sidekiq 6.5, options - null	55s
Ruby 3.4 & Sidekiq 6.5, options - null	52s
Ruby jruby & Sidekiq 6.5, options - null	1m 27s
Ruby 2.7 & Sidekiq 7.0, options - null	45s
Ruby 3.0 & Sidekiq 7.0, options - null	50s
Ruby 3.1 & Sidekiq 7.0, options - null	53s
Ruby 3.2 & Sidekiq 7.0, options - { "rubyopt": "--enable-frozen-string-literal --debug=frozen-string-literal" }	1m 1s
Ruby 3.3 & Sidekiq 7.0, options - null	53s
Ruby 3.4 & Sidekiq 7.0, options - null	52s
Ruby jruby & Sidekiq 7.0, options - null	1m 18s
Ruby 2.4 & Sidekiq 5, options - null	42s
Ruby 2.5 & Sidekiq 5, options - null	37s
Ruby 2.5 & Sidekiq 6, options - null	37s
Ruby 2.6 & Sidekiq 5, options - null	39s
Ruby 2.6 & Sidekiq 6, options - null	40s
Ruby jruby & Sidekiq 6, options - null	1m 21s
	24m 20s

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