add no-backend to drift example

Author: motatoes

docs/ce/features/drift-detection.mdx

@@ -25,6 +25,7 @@ jobs:
       uses: diggerhq/digger@vLatest
       with:
         mode: drift-detection
+        no-backend: true
         setup-aws: true
         aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
         aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}