chore: add environment variable to ephemeral example like default / multi-runner

Author: npalm

examples/ephemeral/.terraform.lock.hcl

@@ -1,5 +1,5 @@
 locals {
-  environment = "ephemeral"
+  environment = var.environment != null ? var.environment : "ephemeral"
   aws_region  = "eu-west-1"
 }
 

examples/ephemeral/main.tf

@@ -6,3 +6,10 @@ variable "github_app" {
     key_base64 = string
   })
 }
+
+variable "environment" {
+  description = "Environment name, used as prefix"
+
+  type    = string
+  default = null
+}