Fix Gemfile & Dockerfile to get passing tests #475

Job	Run time
ruby_edge (gemfiles/rails_6_0.gemfile)	29s
rails_edge	28s
ruby_edge (gemfiles/rails_6_1.gemfile)	29s
ruby_edge (gemfiles/rails_7_0.gemfile)	16s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	34s
ruby_edge (gemfiles/rails_7_1.gemfile)	28s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	25s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	27s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	27s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	31s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	26s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	34s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	37s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	32s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	27s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	29s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	25s
Ruby 3.3 (gemfiles/rails_6_0.gemfile)	24s
Ruby 3.3 (gemfiles/rails_6_1.gemfile)	32s
Ruby 3.3 (gemfiles/rails_7_0.gemfile)	34s
Ruby 3.3 (gemfiles/rails_7_1.gemfile)	38s
	10m 12s

Provide feedback