AWS ecs-cli is missing from -ecs image
I would like to use the ecs-cli from AWS in the ecs cloud deployment image.
The ecs-cli allows you to deploy to ECS using configuration files [based on docker-compose syntax](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/cmd-ecs-cli.html) and a separate aws specific parameters file. Because our team is already well versed in docker-compose syntax, it makes sense to use that instead of a AWS specific task definition.
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