[FR] Enforcedly use internal ip with gke-deploy

[ridhoadya]

Detailed Feature Information

Which builder is relevant to this request?
gke-deploy

Is your feature request related to a problem? Please describe.
I have a gke cluster with external and internal endpoint enabled, i want gke-deploy enforcedly to use internal ip, i can do it easily in gcr.io/cloud-builders/kubectl by using CLOUDSDK_GET_CREDENTIALS_OPTS=--internal-ip, when i checked the code there is no option for that or might be i miss and the config exist?

Describe the solution you'd like
Add capability to have something like this:

steps:
  - name: "gcr.io/cloud-builders/gke-deploy"
     args:
       - "apply"
       - "--filename=..."
       - "--cluster=..."
       - "--location=..."
     env:
       - "CLOUDSDK_GET_CREDENTIALS_OPTS=--internal-ip"

Describe alternatives you've considered

Additional context