Require inbound ECS traffic to originate from VPC #69
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Currently, the ECS security group that's bound to the EC2 instances allows all traffic. This PR restricts that to traffic originating from the VPC, which includes the public load balancer that actually routes traffic to these instances.
Sadly, we cannot easily use the load balancer's security group because that would introduce a circular dependency in the CloudFormation stacks.
This was tested in nextflow-dev and confirmed to work gracefully. Only the inbound rule is replaced, not the entire security group.