Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 7m 9s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 11s
·
Ran in 2m 57s
:docker: rubylang/ruby:master-debug
Waited 6s
·
Ran in 6m 31s
Total Job Run Time: 10m 0s