chore: update release workflows to include environment variables and streamline publishing steps

.gitea/workflows/release-testpypi.yaml

@@ -19,6 +19,10 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    env:
+      UV_INDEX_URL: https://test.pypi.org/simple/
+      UV_EXTRA_INDEX_URL: https://pypi.org/simple/
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -32,6 +36,5 @@ jobs:
           uv build
       - name: Publish (TestPyPI)
         run: |
-          uv pip install twine
-          uv run twine upload --repository-url https://test.pypi.org/legacy/ --skip-existing dist/*
+          uv publish --index-url https://test.pypi.org/legacy/ --username __token__ --password ${{ secrets.TESTPYPI_API_TOKEN }}