Update build.yml

Author: vsmalladi

.github/workflows/build.yml

@@ -26,5 +26,5 @@ jobs:
         with:
           branch: gh-pages
           folder: docs
-          target-folder: ${{ github.ref == 'refs/heads/main'|| '' }}  # Deploy to docs/index.html only if on main
+          target-folder: ${{ github.ref == 'refs/heads/main' && 'docs/index.html' || '' }}  # Deploy to docs/index.html only if on main
           clean: docs  # Clean only if on the main branch