Nightly CI build for the Rails repo

:pipeline: rails-nightly-initial-pipeline
rubylang/ruby:master
actioncable (master)
actionmailbox (master)
actionmailer (master)
actionpack (master)
actionpack (master) [rack-2]
actionpack (master) [rack-3-0]
actionpack (master) [rack-head]
actiontext (master)
actionview (master)
activejob (master)
activemodel (master)
activerecord mysql2 (master)
activerecord mysql2 (master) [mariadb]
activerecord mysql2 (master) [mysql_5_7]
activerecord mysql2 (master) [prepared_statements]
activerecord postgresql (master)
activerecord sqlite3 (master)
activerecord sqlite3_mem (master)
activerecord trilogy (master) [mariadb]
activerecord trilogy (master) [mysql_5_7]
activestorage (master)
activesupport (master)
guides (master)
actioncable integration (master)
activejob integration (master)
activerecord trilogy (master)