Only load fog-rackspace on Rails 6.x due to incompatibility with fog-… #580

Job	Run time	Billable time
RSpec and Cucumber (2.7, gemfiles/rails-7-0.gemfile, false)	3m 37s	0s
RSpec and Cucumber (3.0, gemfiles/rails-7-0.gemfile, false)	1m 37s	0s
RuboCop	53s	0s
RSpec and Cucumber (3.1, gemfiles/rails-7-0.gemfile, false)	1m 41s	0s
RSpec and Cucumber (3.2, gemfiles/rails-7-0.gemfile, false)	1m 32s	0s
RSpec and Cucumber (jruby, gemfiles/rails-7-0.gemfile, false)	2m 48s	0s
RSpec and Cucumber (2.5, gemfiles/rails-6-0.gemfile, false)	3m 2s	0s
RSpec and Cucumber (2.6, gemfiles/rails-6-1.gemfile, false)	3m 0s	0s
RSpec and Cucumber (3.2, gemfiles/rails-7-1.gemfile, false)	1m 39s	0s
RSpec and Cucumber (3.2, gemfiles/rails-main.gemfile, true)	1m 30s	0s
RSpec and Cucumber (ruby-head, gemfiles/rails-7-1.gemfile, false)	2m 43s	0s
RSpec and Cucumber (jruby-head, gemfiles/rails-7-0.gemfile, true)	2m 29s	0s
	26m 31s	0s

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