ci: use default buildx driver

Jenkinsfile

@@ -167,7 +167,7 @@ python -c "import json; payload=json.load(open('build/coverage.json', encoding='
               fi
               sleep 2
             done
-            docker buildx create --name bstein-builder --driver docker --use || docker buildx use bstein-builder
+            docker buildx use default || docker buildx create --name default --driver docker --use
           '''
         }
       }