feat: add topic kms key name variable (#145)

Co-authored-by: Awais Malik <awmalik@google.com>

Author: AndolsiZied

README.md

@@ -65,6 +65,7 @@ Then perform the following commands on the root folder:
 | region | The region in which resources will be applied. | `string` | n/a | yes |
 | scheduler\_job | An existing Cloud Scheduler job instance | `object({ name = string })` | `null` | no |
 | time\_zone | The timezone to use in scheduler | `string` | `"Etc/UTC"` | no |
+| topic\_kms\_key\_name | The resource name of the Cloud KMS CryptoKey to be used to protect access to messages published on this topic. | `string` | `null` | no |
 | topic\_labels | A set of key/value label pairs to assign to the pubsub topic. | `map(string)` | `{}` | no |
 | topic\_name | Name of pubsub topic connecting the scheduled job and the function | `string` | `"test-topic"` | no |
 | vpc\_connector | The VPC Network Connector that this cloud function can connect to. It should be set up as fully-qualified URI. The format of this field is projects//locations//connectors/*. | `string` | `null` | no |

main.tf

@@ -46,6 +46,7 @@ module "pubsub_topic" {
   create_topic        = var.scheduler_job == null ? true : false
   grant_token_creator = var.grant_token_creator
   topic_labels        = var.topic_labels
+  topic_kms_key_name  = var.topic_kms_key_name
 }
 
 /******************************************

variables.tf

@@ -174,6 +174,12 @@ variable "topic_labels" {
   default     = {}
 }
 
+variable "topic_kms_key_name" {
+  type        = string
+  description = "The resource name of the Cloud KMS CryptoKey to be used to protect access to messages published on this topic."
+  default     = null
+}
+
 variable "message_data" {
   type        = string
   description = "The data to send in the topic message."