Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 7m 40s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 4m 59s
:docker: rubylang/ruby:master-debug
Waited 2s
·
Ran in 7m 2s
Total Job Run Time: 12m 35s