Exclude symbols from preview push

Author: wcoder

.github/workflows/release-preview.yml

@@ -40,7 +40,7 @@ jobs:
           name: nupkg
       - name: Push to GitHub
         run: |
-          dotnet nuget push ./nupkg/* \
+          dotnet nuget push ./nupkg/*.nupkg \
             --source ${FEED_URL} \
             --api-key ${FEED_KEY} \
             --skip-duplicate