Fix Gemfile & Dockerfile to get passing tests #456

Job	Run time
rails_edge	30s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 46s
ruby_edge (gemfiles/rails_6_1.gemfile)	1m 41s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	47s
ruby_edge (gemfiles/rails_7_0.gemfile)	1m 51s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	40s
ruby_edge (gemfiles/rails_7_1.gemfile)	1m 46s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	39s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	39s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	45s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	42s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	44s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	44s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	43s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	42s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	43s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	42s
Ruby 3.3 (gemfiles/rails_6_0.gemfile)	52s
Ruby 3.3 (gemfiles/rails_6_1.gemfile)	49s
Ruby 3.3 (gemfiles/rails_7_0.gemfile)	54s
Ruby 3.3 (gemfiles/rails_7_1.gemfile)	55s
	19m 34s

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