CI

Add pending test on maintaining columns order #37

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Run time

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Job	Run time
Ruby 2.7, Rails 6.0	1m 8s
Ruby 2.7, Rails 6.1	1m 40s
Ruby 2.7, Rails 7.0	1m 1s
Ruby 3.0, Rails 6.0	56s
Ruby 3.0, Rails 6.1	37s
Ruby 3.0, Rails 7.0	40s
Ruby 3.1, Rails 6.0	52s
Ruby 3.1, Rails 6.1	1m 8s
Ruby 3.1, Rails 7.0	48s
Ruby 3.2, Rails 6.0	53s
Ruby 3.2, Rails 6.1	59s
Ruby 3.2, Rails 7.0	46s
	11m 28s