Fix GitHub Actions workflow syntax for ref type check

Summary:
This commit updates the nightly PyPI publish workflow to use the correct syntax for checking the GitHub reference type. The change ensures that the condition evaluates properly during the build process.

Changes:
- Modified the reference type check from `${GITHUB_REF_TYPE}` to `${{ github.ref_type }}` in `.github/workflows/nightly-pypi.yml`.

This adjustment enhances the reliability of the workflow by aligning with the correct GitHub Actions context syntax.

Author: FindHao

.github/workflows/nightly-pypi.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Build sdist/wheel
         run: |
-          if [ "${GITHUB_REF_TYPE}" != "tag" ]; then
+          if [ "${{ github.ref_type }}" != "tag" ]; then
             export SETUPTOOLS_SCM_PRETEND_VERSION=${{ steps.ver.outputs.NVER }}
           fi
           python -m build