Simpplify nuget trusted publishing

Author: roji

.github/workflows/build.yml

@@ -194,7 +194,7 @@ jobs:
         uses: NuGet/login@v1
         id: login
         with:
-          user: ${{ secrets.NUGET_USER }}
+          user: roji
 
       - name: Publish to nuget.org
         run: dotnet nuget push "*.nupkg" --api-key ${{ steps.login.outputs.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json