add repo name

Author: roiser

.github/workflows/mg5_codegen.yml

@@ -52,6 +52,7 @@ jobs:
         with:
           app-id: ${{ secrets.GH_APP_ID }}
           private-key: ${{ secrets.GH_APP_PRIVATE_KEY }}
+          repositories: madgraph4gpu-generated-processes
 #          installation-id: ${{ secrets.GH_APP_INSTALLATION_ID }}
 
       - name: Commit to target repository