AWS ECS Update with new docker image
AWS container service team member here. IF you are still early on in your journey to automate this via a CLI I would suggest you consider moving past the ecs-cli. The follow-on version of this CLI is called AWS Copilot and has more sophistication to implement those workflows. Note that Copilot dropped support for docker compose because we have implemented a native integration with Docker and the new docker compose cli. You can read more here and here.