Infrastructure as code (#3)

* Moves website to website/

* Adds terraform gitignores

* Terraform with AWS provider

* Initialises Terraform

* Locals and variables for provider

* Fetches SSL certificate from ACM

* S3 static website bucket

* CloudFront distribution

* Route53 records

* Deployment workflow uses secret S3 bucket suffix

* Adds README

---------

Co-authored-by: Joe Carstairs <65492573+Sycamost@users.noreply.github.com>

infrastructure/s3.tf

@@ -0,0 +1,78 @@
+resource "aws_s3_bucket" "website" {
+  bucket = local.bucket_name
+}
+
+locals {
+  bucket_name = "${local.domain}-${var.secret_s3_bucket_suffix}"
+}
+
+resource "aws_s3_bucket_website_configuration" "website" {
+  bucket = aws_s3_bucket.website.id
+
+  index_document {
+    suffix = "index.html"
+  }
+
+  error_document {
+    key = "error/index.html"
+  }
+}
+
+resource "aws_s3_bucket_ownership_controls" "website" {
+  bucket = aws_s3_bucket.website.id
+
+  rule {
+    object_ownership = "BucketOwnerPreferred"
+  }
+
+  depends_on = [aws_s3_bucket_public_access_block.website]
+}
+
+resource "aws_s3_bucket_public_access_block" "website" {
+  bucket = aws_s3_bucket.website.id
+
+  block_public_acls       = false
+  block_public_policy     = false
+  ignore_public_acls      = false
+  restrict_public_buckets = false
+}
+
+resource "aws_s3_bucket_acl" "website" {
+  bucket = aws_s3_bucket.website.id
+
+  acl = "public-read"
+
+  depends_on = [aws_s3_bucket_ownership_controls.website]
+}
+
+resource "aws_s3_bucket_versioning" "website" {
+  bucket = aws_s3_bucket.website.id
+
+  versioning_configuration {
+    status = "Disabled"
+  }
+}
+
+resource "aws_s3_bucket_policy" "website" {
+  bucket = aws_s3_bucket.website.id
+  policy = data.aws_iam_policy_document.website.json
+}
+
+# TODO: can we restrict access to just from the CloudFront distro?
+data "aws_iam_policy_document" "website" {
+  statement {
+    sid    = "AllowPublicRead"
+    effect = "Allow"
+    resources = [
+      "arn:aws:s3:::${local.bucket_name}",
+      "arn:aws:s3:::${local.bucket_name}/*",
+    ]
+    actions = ["S3:GetObject"]
+    principals {
+      type        = "*"
+      identifiers = ["*"]
+    }
+  }
+
+  depends_on = [aws_s3_bucket_public_access_block.website, aws_s3_bucket.website]
+}