fix: corrected logic for the Codecov secret check

Author: kaifcodec

.github/workflows/ci.yml

@@ -76,9 +76,10 @@ jobs:
           path: test-output
 
       - name: (Optional) Upload coverage to Codecov
-        if: success() && secrets.CODECOV_TOKEN
+        if: success() && env.CODECOV_TOKEN != ''
         uses: codecov/codecov-action@v4
         with:
           files: test-output/coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}