Add definition for PVC Base and ECS cluster on AWS IaaS

[rsuplina]

Tested the deployment, ✅ "works on my Machine"

[clevesque]

a few notes on this example: Can we avoid hardcoding instance type, instance counts, disk sizes/types and ami types inside the terraform config files? Would like to have the option parameterize those values and pass in from definition.yml Would like to use a ElasticIP on the bastion, instead of transient public IP. ty