Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 6m 10s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 3m 40s
:docker: rubylang/ruby:master-debug
Waited 3s
·
Ran in 5m 34s
Total Job Run Time: 9m 46s