Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 6m 20s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 3m 27s
:docker: rubylang/ruby:master-debug
Waited 9s
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Ran in 5m 38s
Total Job Run Time: 9m 37s