Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 7m 45s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 5m 15s
:docker: rubylang/ruby:master-debug
Waited 2s
·
Ran in 7m 9s
Total Job Run Time: 12m 58s