chore: set integration test environment variable

Author: WqyJh

.github/workflows/coverage.yml

@@ -28,3 +28,4 @@ jobs:
         uses: codecov/codecov-action@v4
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}