openvidu-deployment: GCP - Added zone dependency becasue its required

openvidu-deployment/community/singlenode/gcp/tf-gpc-openvidu-singlenode.tf

@@ -96,6 +96,7 @@ locals {
 resource "google_compute_instance" "openvidu_server" {
   name         = lower("${var.stackName}-vm-ce")
   machine_type = var.instanceType
+  zone         = var.zone
 
   tags = [lower("${var.stackName}-vm-ce")]
 

openvidu-deployment/community/singlenode/gcp/variables.tf

@@ -12,6 +12,12 @@ variable "region" {
   default     = "europe-west1"
 }
 
+variable "zone" {
+  description = "GCP zone that some resources will use."
+  type        = string
+  default     = "europe-west1-b"
+}
+
 variable "stackName" {
   description = "Stack name for OpenVidu deployment."
   type        = string

openvidu-deployment/community/singlenode/gcp/versions.tf

@@ -15,5 +15,6 @@ terraform {
 provider "google" {
   project = var.projectId
   region  = var.region
+  zone    = var.zone
 }