title: Find CodePipeline CIDR to add it to EC2 Security Group inbound rules
body: <p>We are using AWS CodePipeline and at the build step we want to call an API hosted on an EC2 instance. That EC2 instance has a security group with some inbound rules. Is there any way to find out CIDR of the CodeBuild docker fleet, so we can add it to EC2 security group inbound rules, so that every stage from CodePipeline can call that API?</p>