Add skip-existing option when uploading python pkg (#136)

In case the release workflow fails for something else (e,g. releasing
npm package), with this change the upload process doesn't fail if the
python package has been already uploaded.

Author: Toni Reina

.github/workflows/release-workflow.yaml

@@ -51,6 +51,7 @@ jobs:
           uv build
           uv run twine upload \
             --repository-url https://us-python.pkg.dev/qdrant-cloud/python/ \
+            --skip-existing \
             --username oauth2accesstoken \
             --password "$(gcloud auth print-access-token)" \
             dist/*