Using new usage scenario syntax

Author: ArneTR

usage_scenario_warm.yml

@@ -22,9 +22,9 @@ services:
       dockerfile: ./Dockerfile
     shell: bash
     setup-commands:
-      - /venv/bin/python manage.py migrate
-      - /venv/bin/python manage.py load_initial_data
-      - wget --recursive --spider --no-directories http://app:8000/ -o warmup.log || true
+      - command: /venv/bin/python manage.py migrate
+      - command: /venv/bin/python manage.py load_initial_data
+      - command: wget --recursive --spider --no-directories http://app:8000/ -o warmup.log || true
        # wget issues an error code 8 due to some images returning 404. We could catch the code 8 specifically, but
         # it would not tell us if these are the known images or some other problems with the sever occured.
         # Sadly this call is very flaky and might still show up as successful even if cache warmup did not really work :(