feat(terraform): Add variables configuration

terraform/aws-infrastructure/variables.tf

@@ -0,0 +1,79 @@
+# Terraform Variables Configuration
+# See README.md for usage examples
+
+variable "aws_region" {
+  description = "AWS region"
+  type        = string
+  default     = "us-east-1"
+}
+
+variable "environment" {
+  description = "Environment (dev/staging/production)"
+  type        = string
+  validation {
+    condition     = contains(["dev", "staging", "production"], var.environment)
+    error_message = "Must be dev, staging, or production"
+  }
+}
+
+variable "project_name" {
+  description = "Project name for resource naming"
+  type        = string
+}
+
+variable "vpc_cidr" {
+  description = "VPC CIDR block"
+  type        = string
+  default     = "10.0.0.0/16"
+}
+
+variable "enable_nat_gateway" {
+  description = "Enable NAT Gateway"
+  type        = bool
+  default     = true
+}
+
+variable "instance_type" {
+  description = "EC2 instance type"
+  type        = string
+  default     = "t3.medium"
+}
+
+variable "asg_min_size" {
+  description = "ASG minimum size"
+  type        = number
+  default     = 2
+}
+
+variable "asg_max_size" {
+  description = "ASG maximum size"
+  type        = number
+  default     = 10
+}
+
+variable "db_username" {
+  description = "Database username"
+  type        = string
+  sensitive   = true
+}
+
+variable "db_password" {
+  description = "Database password"
+  type        = string
+  sensitive   = true
+}
+
+variable "db_instance_class" {
+  description = "RDS instance class"
+  type        = string
+  default     = "db.t3.medium"
+}
+
+variable "alert_email_addresses" {
+  description = "Email addresses for alerts"
+  type        = list(string)
+  default     = []
+}
+
+# See full variables list in documentation
+# For complete configuration examples see environments/