Remove artifacts upload from pull request

Author: FangCunWuChang

.github/workflows/build-artifacts.yml

@@ -72,6 +72,7 @@ jobs:
         length: 7
 
     - name: Upload artifacts
+      if: github.event_name != 'pull_request'
       uses: actions/upload-artifact@v4
       with:
         name: TuneLab-${{ matrix.runtime }}-${{ steps.short-sha.outputs.sha }}