Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 9m 16s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 5m 47s
:docker: rubylang/ruby:master-debug
Waited 4s
·
Ran in 8m 14s
Total Job Run Time: 14m 57s