List app revisions

curl --request GET \
  --url https://cloud-api.phala.com/api/v1/apps/{app_id}/revisions

{
  "revisions": [
    {
      "revision_id": "<string>",
      "app_id": "<string>",
      "vm_uuid": "<string>",
      "compose_hash": "<string>",
      "created_at": "<string>",
      "trace_id": "<string>",
      "operation_type": "<string>",
      "triggered_by": {
        "object_type": "user",
        "id": "usr_0123abcd",
        "username": "<string>",
        "avatar_url": "<string>"
      },
      "cvm": {
        "vm_uuid": "<string>",
        "object_type": "cvm",
        "app_id": "<string>",
        "name": "<string>"
      },
      "workspace": {
        "id": "<string>",
        "name": "<string>",
        "object_type": "workspace",
        "slug": "<string>",
        "avatar_url": "<string>"
      }
    }
  ],
  "total": 123,
  "page": 123,
  "page_size": 123,
  "total_pages": 123
}