Oracle Cloud Infrastructure templates.
See https://docs2.fortinet.com/vm/oci/fortigate/6.0/deploying-fortigate-vm-using-terraform/6.0.0/295655/using-terraform-to-deploy-a-single-fortigate-vm for instructions of how to create a FortiGate-VM instance using Terraform templates placed in this repo.
It also explains cloud-init (optional) as part of the Terraform deployment.