Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 32m 53s
: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 18s
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railties (master) [rack-3-0]rake test
Waited 4s
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Ran in 10m 25s
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railties (master) [rack-3-0]rake test
Waited 6s
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Ran in 4m 38s
Total Job Run Time: 10h 50m