fix publish docs

[tarunKoyalwar]

Proposed changes

Note that we explicitly specify ${{ github.head_ref }} in the checkout Action. This is required in order to work with the pull_request event (or any other non-push event).

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)