[ECS] [request] Support for alternative docker runtimes

[mliezun]

Summary

Support for alternative docker runtimes by specifying ECS_DOCKER_RUNTIME.

Description

To be able to use custom docker runtimes like sysbox is necessary to do some pretty involved configurations as showed in this post: https://aws.amazon.com/pt/blogs/aws-brasil/utilizando-runtimes-customizados-no-amazon-ecs/.

By providing an env variable like ECS_DOCKER_RUNTIME we could make the configuration easier by building an AMI based on Amazon Linux (1, 2 or 2023), installing sysbox and then setting echo "ECS_DOCKER_RUNTIME=sysbox-runc" >> /etc/ecs/ecs.conf.

Without that variable we're forced to start and manage the ECS agent manually as well as setting up network configuration with iptables.

[amogh09]

Hi @mliezun. Thanks for creating this issue and sorry for the delay in our response. I will move transfer this issue to our feature requests repository.

[mliezun]

Thanks @amogh09 is there a way to link the open PR aws/amazon-ecs-agent#4073 with this issue?