Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 6m 55s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 2s
·
Ran in 3m 44s
:docker: rubylang/ruby:master-debug
Waited 2s
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Ran in 5m 57s
Total Job Run Time: 10m 36s