Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 27m 19s
:pipeline: rails-nightly-initial-pipeline
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railties (master) [rack-3-0]rake test
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Ran in 10m 14s
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railties (master) [rack-3-0]rake test
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Ran in 4m 48s
Total Job Run Time: 10h 18m