Hello world from a container.

  platform              : ecs-fargate
  session               : 2.2
  hostname              : ip-10-20-12-109.ec2.internal
  container_id_hint     : ip-10-20-12-109.ec2.internal
  python                : 3.12.14
  arch                  : x86_64
  ecs_metadata_endpoint : present

The same image serves Sessions 2.1, 2.2 and 2.3. Only the orchestrator
changes, which is why the platform field above is worth reading.

  /healthz   liveness, plain text
  /facts     the same fields as JSON