added availibility zone

Signed-off-by: Mark Bolwell <mark.bollyuk@gmail.com>

.github/workflows/github_networks.tf

@@ -18,6 +18,7 @@ resource "aws_internet_gateway" "IGW" {
 resource "aws_subnet" "publicsubnets" {
   vpc_id            = aws_vpc.Main.id
   cidr_block        = var.public_subnets
+  availability_zone = var.availability_zone
   tags = {
     Environment = "${var.environment}"
     Name        = "${var.namespace}-pubsub"

.github/workflows/terraform.tfvars

@@ -1,4 +1,5 @@
 // vars should be loaded by OSname.tfvars
+availability_zone      = "us-east-1b"
 aws_region             = "us-east-1"
 ami_os                 = var.ami_os
 ami_username           = var.ami_username

.github/workflows/variables.tf

@@ -6,6 +6,12 @@ variable "aws_region" {
   type        = string
 }
 
+variable "availability_zone" {
+  description = "List of availability zone in the region"
+  default     = "us-east-1b"
+  type        = string
+}
+
 variable "instance_type" {
   description = "EC2 Instance Type"
   default     = "t3.micro"