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The ubuntu-latest runner image (20260126.10+) ships a pre-installed Ruby 4.0.1 that causes native extension builds and bundler operations to fail (ruby/rubygems#9284). Remove it from the tool cache to force setup-ruby to download a working build from ruby-builder. Also update RubyGems to latest.
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Motivation
The
ubuntu-latestrunner image (20260126.10+) ships a pre-installed Ruby 4.0.1 that causes native extension builds and bundler operations to fail. Thechmod +tworkaround from ruby/rubygems#9284 is insufficient — the pre-installed Ruby has deeper issues beyond the sticky bit.Implementation
/opt/hostedtoolcachebeforesetup-rubyruns, forcing it to download a working build from ruby-builderAutomated Tests
Existing CI matrix covers this — the Ruby 4.0 on ubuntu-latest job now passes.