Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 7m 0s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 2s
·
Ran in 4m 29s
:docker: rubylang/ruby:master-debug
Waited 3s
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Ran in 5m 52s
Total Job Run Time: 11m 26s