Add terraform config for CloudFront

Author: Wintus

cloudfront/main.tf

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+

cloudfront/outputs.tf

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+

cloudfront/providers.tf

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+provider "aws" {
+  region = "${var.main_aws_region}"
+}
+
+provider "aws" {
+  alias  = "nova"
+  region = "us-east-1"
+}

cloudfront/terraform.tf

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+terraform {
+  required_version = "~> 0.11"
+
+  backend "s3" {
+    region = "ap-northeast-1"
+    bucket = "infra.wintus.tokyo"
+    key    = "lambda-edge-image-resize"
+  }
+}

cloudfront/variables.tf

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+variable "main_aws_region" {
+  default = "ap-northeast-1"
+}