Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 10m 47s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 4m 59s
:docker: rubylang/ruby:master-debug
Waited 4s
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Ran in 10m 8s
Total Job Run Time: 15m 41s