Update RubyGems in CI to fix Ruby 4.0 native extension builds#3940
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Update RubyGems in CI to fix Ruby 4.0 native extension builds#3940
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The ubuntu-latest runner image (20260126.10+) ships a pre-installed Ruby 4.0.1 with a broken rbconfig that prevents native extension compilation (e.g. erb 6.0.1). This causes setup-ruby to use the broken pre-installed version instead of downloading from ruby-builder. Remove the pre-installed Ruby 4.0 from the tool cache before setup-ruby runs, forcing it to download a working build. Also update RubyGems to latest as a general improvement.
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Ruby 4.0.1 ships with RubyGems 4.0.3, which has a missing
require 'etc'ininstaller.rb(fixed in 4.0.4 via ruby/rubygems#9242). This causes native extension compilation to fail with a NameError whenEtchasn't been loaded by another code path. The failure only manifests on Ubuntu because the runner image now ships a pre-installed Ruby 4.0.1 that skips the ruby-builder download/extraction which previously loadedetcas a side effect.Motivation
Implementation
Automated Tests
Manual Tests