fix example role

roles/example/tasks/main.yml

@@ -26,8 +26,8 @@
     service_container_env:
       TZ: "Etc/UTC"
     service_additional_containers:
-      name: worker
+      - name: worker
-      # image: "docker.io/library/hello-world:latest"
+        # image: "docker.io/library/hello-world:latest"
-      mounts: []
+        mounts: []
-      publish_ports: []
+        publish_ports: []
-      # env: {}
+        # env: {}