ci: Pin Bundler to 4.0.6 in RuboCop workflow as workaround for ruby/rubygems#9536#290
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…ubygems#9536 The RuboCop workflow started failing on master at 2026-05-12T01:01 UTC with: Could not find compatible versions against the multi-gemspec git source `rails/rails` whose top-level gem is in a filtered-out group when `BUNDLE_ONLY=rubocop bundle install` runs under Ruby 4.0.4 (Bundler 4.0.11). The regression is tracked in ruby/rubygems#9536; Bundler 4.0.5 and 4.0.6 succeed while 4.0.7+ fail. Pin Bundler explicitly so the workflow keeps rolling on `ruby-version: "4.0"`: - set BUNDLER_VERSION=4.0.6 at the job level so every bundle invocation resolves to that version - gem install bundler -v 4.0.6 so the version is actually present (the ruby-builder tarball ships only one Bundler, and current 4.0.x tarballs no longer ship 4.0.6) Drop both once Bundler ships a fix for ruby/rubygems#9536.
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Bundler 4.0.12 (https://blog.rubygems.org/2026/05/20/4.0.12-released.html) includes ruby/rubygems#9544, which fixes the multi-gemspec git source resolver regression tracked in ruby/rubygems#9536 — the bug that PR #290 worked around by pinning Bundler to 4.0.6 in the RuboCop workflow. - Drop the BUNDLER_VERSION env var and the "Pin Bundler to 4.0.6" step from rubocop.yml; the workaround is no longer needed. - Add `rubygems: latest` to the workflows that exercise modern CRuby (rubocop, test, test_11g, test_11g_ojdbc11), matching the pattern release.yml already uses, so CI resolves Bundler 4.0.12 instead of whatever ships in the setup-ruby tarball. setup-ruby handles JRuby via `gem update --system`, so JRuby matrix entries are safe. ruby_head.yml and jruby_head.yml are intentionally left alone — per setup-ruby docs, head builds are not updated. truffleruby.yml and test_gemfiles.yml are also untouched (TruffleRuby compatibility, and test_gemfiles targets Ruby 2.4–3.3 which cannot install RubyGems 4.x). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
The
RuboCopworkflow started failing on master at 2026-05-12T01:01 UTC (run 25706708602). With Ruby 4.0.4 (Bundler 4.0.11 bundled),BUNDLE_ONLY=rubocop bundle installfails to resolve this Gemfile against the multi-gemspec git sourcerails/railswhose top-level gem is in a filtered-out group, aborting with:Bundler 4.0.5 and 4.0.6 succeed; 4.0.7 through 4.0.11 fail. The upstream Bundler regression is tracked in ruby/rubygems#9536.
Pin Bundler explicitly so the workflow keeps rolling on
ruby-version: "4.0":BUNDLER_VERSION=4.0.6at the job level so everybundleinvocation in the workflow resolves to that versiongem install bundler -v 4.0.6so the version is actually present in the Ruby image (the ruby-builder tarball ships only one Bundler; current 4.0.x tarballs no longer ship 4.0.6)Once Bundler ships a fix for ruby/rubygems#9536, drop `BUNDLER_VERSION` and the install step.
Mirrors rsim/oracle-enhanced#2767.
Test plan