How can I pass in command line arguments with Kubernetes Deployment?

Question

I am trying to figure out how to simulate passing in command line arguments, that would usually be passed in when running a Docker image. I'm using Kubernetes Deployment, and have successfully deployed my container, and it is running.

I want to replicate the functionality of passing in: --basicAuth.username=myusername --basicAuth.password=mypassword as part of a LHCI image.

I'm using Terraform, and the kubernetes_deployment resource. So far, I've tried using the args attribute, but I haven't been able to get this working:

          args = [
            - basicAuth.username,
            - myusername,
            - basicAuth.password,
            - $(basicAuthPassword)
          ]

where basicAuthPassword is a container secret variable that I am specifing within the resource.

Any help on this would be greatly appreciated!