Only release from the modelcontextprotocol/csharp-sdk repo

Author: jeffhandley

.github/workflows/release.yml

@@ -32,6 +32,9 @@ on:
 
 jobs:
   build-all-configs:
+    # Only release from the modelcontextprotocol/csharp-sdk repository
+    if: ${{ github.repository == 'modelcontextprotocol/csharp-sdk' }}
+
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]