Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 50m 48s
:pipeline: rails-nightly-initial-pipeline
activerecord mysql2 (master) [prepared_statements]rake db:mysql:rebuild mysql2:test
Waited 5s
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Ran in 4m 30s
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railties (master) [rack-3-0]rake test
Waited 4s
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Ran in 10m 18s
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railties (master) [rack-3-0]rake test
Waited 9s
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Ran in 4m 50s
Total Job Run Time: 12h 8m