Restore pushing to LabsFeed

.github/workflows/build.yml

@@ -161,6 +161,10 @@ jobs:
             --username dummy --password ${{ secrets.DEVOPS_PACKAGE_PUSH_TOKEN }}
           dotnet nuget push "**/*.nupkg" --api-key dummy --source PullRequests --skip-duplicate
 
+      - name: Push packages
+        if: ${{ github.ref == 'refs/heads/main' }}
+        run: dotnet nuget push "**/*.nupkg" --api-key dummy --source LabsFeed --skip-duplicate
+
       # Run tests
       - name: Setup VSTest Path
         uses: darenm/Setup-VSTest@v1