shared-config: sync docs Gemfile.lock using main bundler version

[p-linnane]

Previously, brew was entirely excluded from Gemfile.lock syncing and the docs bundler version was read from the (potentially stale) docs lock. This meant brew/docs and private/docs required manual version bumps.

Now, docs Gemfile.lock files are synced for all repos (including brew), using the bundler version from Library/Homebrew/Gemfile.lock as the single source of truth. This allows the entire ecosystem to sync in one run.

[Copilot]

Pull request overview

Updates the shared-config sync script to treat Homebrew/brew’s Library/Homebrew/Gemfile.lock as the single source of truth for the Bundler version when syncing docs lockfiles across repositories, enabling a full ecosystem sync (including brew/docs) in one run.

Changes:

• Sync docs/Gemfile.lock for brew while continuing to skip non-docs lockfiles in brew (source of truth).
• Derive the Bundler version from Library/Homebrew/Gemfile.lock for all lockfile updates (including docs).
• Refine the script’s selection logic for which Gemfile.lock files to update.

Comments suppressed due to low confidence (1)

.github/actions/sync/shared-config.rb:288

• The return value of system "bundle", "update", ... isn’t checked. If bundle update fails (e.g., missing gems, network issues), the script will continue and may report “No changes detected” instead of failing the sync. Consider aborting on failure (e.g., abort/raise when system returns false) so the action fails loudly.

      puts "Running bundle update (with Bundler #{bundler_version})..."
      system "bundle", "update", "--ruby", "--bundler=#{bundler_version}", "--quiet", out: "/dev/null"
    end

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