ci: per-Ruby Gemfile so modern Rubies run latest libs#2
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Replace the global `parallel < 2` pin (which held every Ruby to the old lib) with a dedicated gemfiles/ruby_3_2.gemfile that eval_gemfiles the root Gemfile and pins only the gems whose latest majors dropped 3.2. The 3.2 matrix row uses it via BUNDLE_GEMFILE; every other Ruby uses the root Gemfile with up-to-date deps (parallel 2.x). Each gemfile keeps its own lockfile.
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What
Replace the global
parallel < 2pin with a dedicatedgemfiles/ruby_3_2.gemfileso each Ruby runs the newest libs it can:Gemfile— un-pinned; modern Rubies (3.3 / 3.4 / 4.0 / head) get up-to-date deps (parallel 2.x, …).gemfiles/ruby_3_2.gemfile—eval_gemfiles the root and pins only the gems whose latest majors dropped 3.2 (currently justparallel < 2). Has its own lockfile.BUNDLE_GEMFILE; every other row uses the rootGemfile.Why
parallel 2.x(a rubocop dependency) requires Ruby >= 3.3, which brokebundle installon the 3.2 row. The previous fix pinnedparallel < 2globally — correct, but it held every Ruby to the old lib. This keeps 3.2 green without holding modern Rubies back.Verified locally (Ruby 4.0.5)
parallel 2.1.0;bundle exec rakegreen (rubocop · rbs · 57 tests).BUNDLE_GEMFILE=gemfiles/ruby_3_2.gemfile→parallel 1.28.0; same gate green.Note
dependabot.yml's bundler updater watches/only, sogemfiles/ruby_3_2.gemfile.lockwon't get automatic updates. Can add a second bundler entry for it if wanted.