Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 27m 19s
:pipeline: rails-nightly-initial-pipeline
actionpack (master) [rack-head]rake test
Waited 10s
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Ran in 1m 46s
guides (master)rake test
Waited 11s
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Ran in 4m 29s
guides (yjit)rake test
Waited 12s
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Ran in 4m 38s
guides (master-debug)rake test
Waited 40s
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Ran in 5m 33s
Total Job Run Time: 10h 20m