Fix: Update Azure login step to use correct ARM secrets for authentication

Author: dcasati

.github/workflows/copilot-setup-steps.yml

@@ -22,9 +22,9 @@ jobs:
       - name: Azure login
         uses: azure/login@v2
         with:
-          client-id: ${{ secrets.AZURE_CLIENT_ID }}
-          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
-          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+          client-id: ${{ secrets.ARM_CLIENT_ID }}
+          tenant-id: ${{ secrets.ARM_TENANT_ID }}
+          subscription-id: ${{ secrets.ARM_SUBSCRIPTION_ID }}
 
       - name: Verify Azure access
         run: |