* fix(cd): allow deploying instance templates without disk errors
Motivation:
PR #5670 failed in `main` as it was tested with `gcloud compute instances create-with-container`
and even the manual deployment uses `instances`, and it works.
But the one that failed uses `gcloud compute instance-templates create-with-container`
using `instance-template` and it's complaining with: `When attaching or creating a disk that is also being mounted to a container, must specify the disk name`
Based on the documentation, the name is optional when using `create-with-container`,
for both `instances` and `instance-templates`
Source: https://cloud.google.com/sdk/gcloud/reference/compute/instance-templates/create-with-container#--container-mount-disk
Solution:
Revert this specific job as how it was, and do not scale the instances
above 1, as this would cause the following error:
`Instance template specifies a disk with a custom name. This will cause instance group not to scale beyond 1 instance per zone.`
* chore: reduce diff
ae86678034