Add SNS to architecture diagram and output SNS topic ARN (#218)

* SNS topic ARN output
* Add SNS to diagram
* terraform-docs: automated action
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

docs/reference.md

@@ -96,8 +96,11 @@
 |------|-------------|
 | <a name="output_ca_bundle_s3_location"></a> [ca\_bundle\_s3\_location](#output\_ca\_bundle\_s3\_location) | S3 location of CA bundle for use as a TrustStore |
 | <a name="output_cloudfront_domain_name"></a> [cloudfront\_domain\_name](#output\_cloudfront\_domain\_name) | Domain name of CloudFront distribution used for public CRL |
+| <a name="output_external_s3_bucket_name"></a> [external\_s3\_bucket\_name](#output\_external\_s3\_bucket\_name) | External S3 bucket name |
+| <a name="output_internal_s3_bucket_name"></a> [internal\_s3\_bucket\_name](#output\_internal\_s3\_bucket\_name) | Internal S3 bucket name |
 | <a name="output_issuing_ca_cert_s3_location"></a> [issuing\_ca\_cert\_s3\_location](#output\_issuing\_ca\_cert\_s3\_location) | S3 location of Issuing CA certificate file |
 | <a name="output_issuing_ca_crl_s3_location"></a> [issuing\_ca\_crl\_s3\_location](#output\_issuing\_ca\_crl\_s3\_location) | S3 location of Issuing CA CRL file |
 | <a name="output_root_ca_cert_s3_location"></a> [root\_ca\_cert\_s3\_location](#output\_root\_ca\_cert\_s3\_location) | S3 location of Root CA certificate file |
 | <a name="output_root_ca_crl_s3_location"></a> [root\_ca\_crl\_s3\_location](#output\_root\_ca\_crl\_s3\_location) | S3 location of Root CA CRL file |
+| <a name="output_sns_topic_arn"></a> [sns\_topic\_arn](#output\_sns\_topic\_arn) | SNS topic ARN |
 <!-- END_TF_DOCS -->

outputs.tf

@@ -8,6 +8,16 @@ output "ca_bundle_s3_location" {
   description = "S3 location of CA bundle for use as a TrustStore"
 }
 
+output "external_s3_bucket_name" {
+  value       = module.external_s3.s3_bucket_name
+  description = "External S3 bucket name"
+}
+
+output "internal_s3_bucket_name" {
+  value       = module.internal_s3.s3_bucket_name
+  description = "Internal S3 bucket name"
+}
+
 output "issuing_ca_cert_s3_location" {
   value       = contains(var.prod_envs, var.env) ? "${module.external_s3.s3_bucket_domain_name}/${var.project}-issuing-ca.crt" : "${module.external_s3.s3_bucket_domain_name}/${var.project}-issuing-ca-${var.env}.crt"
   description = "S3 location of Issuing CA certificate file"
@@ -27,3 +37,8 @@ output "root_ca_crl_s3_location" {
   value       = contains(var.prod_envs, var.env) ? "${module.external_s3.s3_bucket_domain_name}/${var.project}-root-ca.crl" : "${module.external_s3.s3_bucket_domain_name}/${var.project}-root-ca-${var.env}.crl"
   description = "S3 location of Root CA CRL file"
 }
+
+output "sns_topic_arn" {
+  value       = module.sns-ca-notifications.sns_topic_arn
+  description = "SNS topic ARN"
+}