Added CI workflow

[yoursanonymous]

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/kind feature

• What this PR does / why we need it:
  This PR introduces automated CI/CD checks via GitHub Actions to improve code quality and catch issues before merging.

• Which issue(s) this PR fixes:

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[yashisrani]

@yoursanonymous From what I can see, the Volcano website is built using Docusaurus rather than Hugo. The current workflow sets up Hugo and runs hugo --minify, which doesn’t appear to validate the actual Docusaurus site build.

The Markdown lint step is still useful, but the Hugo build job may no longer provide meaningful validation if the site is fully Docusaurus-based.