Update python-publish.yml

Author: boyuan276

.github/workflows/python-publish.yml

@@ -26,6 +26,10 @@ jobs:
         with:
           python-version: "3.x"
 
+      - name: Clean previous builds
+        run: |
+          rm -rf dist/ build/ *.egg-info
+          
       - name: Build release distributions
         run: |
           # NOTE: put your own distribution build steps here.