Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 33m 44s
:pipeline: rails-nightly-initial-pipeline
activerecord mysql2 (master) [prepared_statements]rake db:mysql:rebuild mysql2:test
Waited 2s
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Ran in 5m 29s
6/12
railties (master) [rack-3-0]rake test
Waited 5s
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Ran in 11m 47s
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railties (master) [rack-3-0]rake test
Waited 6s
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Ran in 4m 33s
Total Job Run Time: 11h 46m