terrascan fails when using Terraform + variable image name with Kubernetes

[mnaser]

• terrascan version: v1.18.3
• Operating System: macOS 13.4 (22F66)

Description

terrascan fails when running against Terraform code where the image is a variable, it fails with an error:

2023-08-31T21:58:20.991-0400    error   commons/extract-container-images.go:268 error fetching containers from k8s resource: /Users/mnaser/Code/terraform-kubernetes-mysql-query/main.tf:46,21-24: Variables not allowed; Variables may not be used here.

.. and then also bombs out:

Violation Details -
    
        Description    :        Apply Security Context to Your Pods and Containers
        File           :        main.tf
        Module Name    :        root
        Plan Root      :        ./
        Line           :        24
        Severity       :        MEDIUM
        -----------------------------------------------------------------------

even if it is there :)

What I Did

mkdir -p /tmp/terrascan-repro
pushd /tmp/terrascan-repro
curl -O https://gist.githubusercontent.com/mnaser/676e7a3b664c4f6eb1cea8635a2350ad/raw/09418debf39eccc79292abee8d1588e6ac825621/main.tf
curl -O https://gist.githubusercontent.com/mnaser/676e7a3b664c4f6eb1cea8635a2350ad/raw/09418debf39eccc79292abee8d1588e6ac825621/variables.tf
❯ terrascan scan --iac-type terraform
2023-08-31T22:06:45.147-0400    error   commons/extract-container-images.go:268 error fetching containers from k8s resource: /tmp/terrascan-repro/main.tf:46,21-24: Variables not allowed; Variables may not be used here.



Violation Details -
    
        Description    :        Apply Security Context to Your Pods and Containers
        File           :        main.tf
        Module Name    :        root
        Plan Root      :        ./
        Line           :        24
        Severity       :        MEDIUM
        -----------------------------------------------------------------------


Scan Summary -

        File/Folder         :   /tmp/terrascan-repro
        IaC Type            :   terraform
        Scanned At          :   2023-09-01 02:06:45.783175 +0000 UTC
        Policies Validated  :   42
        Violated Policies   :   1
        Low                 :   0
        Medium              :   1
        High                :   0