Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 40m 22s
:pipeline: rails-nightly-initial-pipeline
activerecord mysql2 (master) [prepared_statements]rake db:mysql:rebuild mysql2:test
Timed Out
Waited 12s
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Ran in 30m 14s
activerecord mysql2 (master) [prepared_statements]rake db:mysql:rebuild mysql2:test
Waited 10s
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Ran in 4m 2s
Total Job Run Time: 11h 18m