Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 5m 50s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 4m 44s
:docker: rubylang/ruby:master-debug
Waited 8s
·
Ran in 3m 48s
Total Job Run Time: 9m 27s