Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 6m 32s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 4m 18s
:docker: rubylang/ruby:master-debug
Waited 5s
·
Ran in 5m 59s
Total Job Run Time: 10m 45s