setup-node v7: how caching, version files and publishing behavior changed

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The article explains that actions/setup-node installs a Node.js version, adds it to PATH, can restore package manager caches, and can write an .npmrc for publishing. Since v6 it caches npm automatically when package.json names npm as the package manager, and v7.1.0 no longer exports a placeholder NODE_AUTH_TOKEN when registry-url is set. It warns that many workflows copy a setup-node step with a cache line nobody has checked, so major version bumps can silently change caching or break publishing. Caching rules changed twice between v5 and v6, and it recommends reading the caching section before upgrading pinned workflows older than v6. The piece also describes the action's inputs and outputs at tag v7.1.0, including the new cache-primary-key and cache-matched-key outputs.

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