Fix workflow to reference NUGET_API_KEY environment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: IgorRozani

.github/workflows/publish.yml

@@ -8,6 +8,7 @@ on:
 jobs:
   publish:
     runs-on: ubuntu-latest
+    environment: NUGET_API_KEY
 
     steps:
       - name: Checkout