[v-aparnajyothi-y]

Description:
This PR adds documentation and an example workflow demonstrating how to achieve restore-only caching with setup-node using the actions/cache.
The update is based on community feedback from #663 (“Add option to restore cache only”), which proposed adding a restore-only flag to the action.
Instead of introducing new functionality, this documentation clarifies how users can already achieve this behavior using actions/cache.
Related issue:
#663

Check list:

• [ X] Mark if documentation changes are required.

[Copilot]

Pull Request Overview

This PR adds documentation demonstrating how to achieve restore-only caching behavior with setup-node by using the actions/cache action directly. This addresses community feedback requesting a restore-only flag without introducing new functionality, instead showing users how to accomplish this with existing tools.

Key Changes:

• Added a "Restore-Only Cache" section with a complete workflow example
• Included explanatory note about the benefits of restore-only caching

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}