This module is based on the current AWS and Azure configurations, with a few tiny GCP-specific modifications:
* Defaults to only allow your Terraform's host external IP address, which can be optionally disabled. Otherwise, the UIs/APIs are exposed on the internet.
* Exposes the Vault UI and API through the load balancer.
* Uses GCP oslogin to facilitate VM SSH access, without an external SSH IP for all instances.
* Provides optional way to enable preemptible VM instances to save money.
