Add GitHub Actions workflow to build HTML from sample CV

[Copilot]

This PR adds a GitHub Actions workflow that automatically builds an HTML file from the sample.cv.json file on every commit to master and pull request.

Changes Made

• Added .github/workflows/build-html.yml workflow file that:
  • Triggers on pushes to master branch and pull requests
  • Uses Node.js 18 as specified in the README
  • Installs project dependencies with npm install
  • Builds HTML from sample.cv.json using the existing build process
  • Stores the generated HTML as a downloadable artifact with 30-day retention

How It Works

The workflow follows the build instructions from the README.md exactly:

DATA_FILENAME="${{ github.workspace }}/sample.cv.json" \
OUT_DIR="${{ github.workspace }}/output" \
npm run build

The generated HTML file is then uploaded as an artifact named sample-cv-html that can be downloaded from the Actions tab for review and verification.

Testing

The build process has been tested locally and produces a valid HTML file (~26KB) containing the formatted CV based on the sample data.

Fixes #13.

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