Add new output variables (#10)

instances.tf

@@ -3,7 +3,7 @@ locals {
 }
 
 module "spot_requests" {
-  source = "frgrisk/ec2-spot/aws"
+  source  = "frgrisk/ec2-spot/aws"
   version = "~>0.3.2"
 
   for_each = var.spot_requests

outputs.tf

@@ -13,7 +13,22 @@ output "private_subnets" {
   value       = [for k, v in aws_subnet.private : v.id]
 }
 
+output "private_subnets_by_az" {
+  description = "Map of private subnets by availability zone"
+  value       = aws_subnet.private
+}
+
 output "public_subnets" {
   description = "List of IDs of public subnets"
   value       = [for k, v in aws_subnet.public : v.id]
 }
+
+output "public_subnets_by_az" {
+  description = "Map of public subnets by availability zone"
+  value       = aws_subnet.public
+}
+
+output "inter_environment_security_group_id" {
+  description = "ID of the inter-environment security group"
+  value       = module.inter_environment_traffic.security_group_id
+}