Fix Gemfile & Dockerfile to get passing tests #474

Job	Run time
rails_edge	34s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 38s
ruby_edge (gemfiles/rails_6_1.gemfile)	2m 11s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	45s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	43s
ruby_edge (gemfiles/rails_7_0.gemfile)	1m 42s
ruby_edge (gemfiles/rails_7_1.gemfile)	1m 57s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	45s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	43s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	53s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	46s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	52s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	49s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	45s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	46s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	45s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	42s
Ruby 3.3 (gemfiles/rails_6_0.gemfile)	54s
Ruby 3.3 (gemfiles/rails_6_1.gemfile)	54s
Ruby 3.3 (gemfiles/rails_7_0.gemfile)	51s
Ruby 3.3 (gemfiles/rails_7_1.gemfile)	57s
	20m 52s

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