fix: remove duplicate NuGet source addition, use already-configured source

Author: fradav

.github/workflows/build.yml

@@ -45,11 +45,6 @@ jobs:
 
       - name: Install Computo CLI tools
         run: |
-          dotnet nuget add source "https://nuget.pkg.github.com/computorg/index.json" \
-            --name "GitHubPackages" \
-            --username "${{ github.actor }}" \
-            --password "${{ secrets.GITHUB_TOKEN }}" \
-            --store-password-in-clear-text
           dotnet tool install --global Computo.PublicationUpdater.Cli
           echo "$HOME/.dotnet/tools" >> $GITHUB_PATH