Add GitHub Actions workflow for NodeJS with Webpack

[宮崎拓也。 (Takuya-Miyazaki)]

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[Copilot]

Pull request overview

Adds a GitHub Actions workflow intended to build a Node.js/Webpack project on pushes and PRs to main.

Changes:

• Introduces a new CI workflow with a Node.js version matrix (18/20/22).
• Runs a build step intended to compile frontend assets.

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