Chore(fix): condition to set UPDATE environment variable

Author: AzureG03

.github/workflows/sync.yml

@@ -27,10 +27,10 @@ jobs:
           echo "UPSTREAM_COMMITS=$UPSTREAM_COMMITS" >> $GITHUB_ENV
           if [ "$UPSTREAM_COMMITS" -eq "0" ]; then
             echo "No new commits in upstream. Exiting."
-            echo "UPDATE=true" >> $GITHUB_ENV
             exit 0
           fi
           echo "New commits detected: $UPSTREAM_COMMITS"
+          echo "UPDATE=true" >> $GITHUB_ENV
 
       - name: Save Current Commit
         if: env.UPDATE == 'true'