Duplicate job artifact warning on IaC index page

doc/user/infrastructure/index.md

@@ -31,6 +31,12 @@ Amazon S3 or Google Cloud Storage. Its features include:
 
 Read more on setting up and [using GitLab Managed Terraform states](terraform_state.md)
 
+WARNING:
+Like any other job artifact, Terraform plan data is [viewable by anyone with Guest access](../permissions.md) to the repository.
+Neither Terraform nor GitLab encrypts the plan file by default. If your Terraform plan
+includes sensitive data such as passwords, access tokens, or certificates, GitLab strongly
+recommends encrypting plan output or modifying the project visibility settings.
+
 ## Terraform integration in Merge Requests
 
 Collaborating around Infrastructure as Code (IaC) changes requires both code changes and expected infrastructure changes to be checked and approved. GitLab provides a solution to help collaboration around Terraform code changes and their expected effects using the Merge Request pages. This way users don't have to build custom tools or rely on 3rd party solutions to streamline their IaC workflows.