Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 25m 40s
:pipeline: rails-nightly-initial-pipeline
actionpack (master) [rack-head]rake test
Waited 8s
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Ran in 2m 4s
guides (master)rake test
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Ran in 4m 26s
guides (yjit)rake test
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Ran in 4m 23s
guides (master-debug)rake test
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Ran in 6m 55s
Total Job Run Time: 9h 45m