Buddy.Works Terraform IPs into aws_security_group

This is just an example of how to pull in buddy IP's, and then assign them to an aws_security_group using terraform.

The procedure is not specific to aws_security_group, and can be used for anything that needs CIDR blocks or multiple IPs

1. First pull in the IPs dynamically using the provided buddy DNS record

data "dns_a_record_set" "buddy_ips" {
     host = "workers.buddy.works"
}

2.  Inject that into the CIDR blocks, but format the output

resource "aws_security_group" "buddy_works" {
  name        = "buddy-security-group"
  description = "Buddy Security Group"

  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = formatlist("%s/32", data.dns_a_record_set.buddy_ips.addrs)
  }
}