Modify publish.yml to flatten wheel uploads

Updated the publish workflow to create a flattened directory for wheels before copying them.

.github/workflows/publish.yml

@@ -59,13 +59,18 @@ jobs:
       env:
         PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
       run: |
-        # Find ALL wheels from ALL subdirectories
+        # CREATE flattened dir FIRST
+        mkdir -p dist/flattened
+        
+        # Copy ALL wheels from ALL subdirs
         find dist -name "*.whl" -exec cp {} dist/flattened/ \;
-        echo "Flattened wheels:"
+        
+        echo "=== ALL WHEELS FOUND ==="
         ls -la dist/flattened/*.whl
         
         cd dist/flattened
-        echo "Uploading from $(pwd):"
+        echo "=== UPLOADING FROM $(pwd) ==="
         ls -la *.whl
         maturin upload --skip-existing --non-interactive
 
+