Explanation
To deploy a FortiGate HA solution in AWS using Terraform, you need to create an AWS IAM user with permissions to access the AWS resources and services required by the FortiGate-VM. You also need to use CloudShell to install Terraform, which is a tool for building, changing, and versioning infrastructure as code.
References:
Deploying FortiGate-VM using Terraform | AWS Administration Guide
Setting up IAM roles | AWS Administration Guide
Launching the instance using roles and user data | AWS Administration Guide Terraform by HashiCorp