Dev testnet setup

[qdm12]

Target platform: AWS' ECS (elastic container service)

Notes so far (will be updated):

• It's better if we can run it locally, so docker-compose would fit nicely. There is a plugin for AWS' ECS (@timwu20). If we need something more complex such as K8s, we could have it using AWS EKS and run it locally with minkube for example, although docker-compose is more trivial to use especially for newcomers.

[qdm12]

There is a docker-compose plugin for ECS available at https://github.com/docker/compose-cli, I guess it might be the one Tim already uses.