CCM-17379: Persist supplier config (#582)

* Implement supplier-config-ingress lambda

* Remove unnecessary type assertions

---------

Co-authored-by: Mark Slowey <113013138+masl2@users.noreply.github.com>

Author: stevebux

infrastructure/terraform/components/api/locals_alarms.tf

@@ -21,12 +21,14 @@ locals {
     letter_updates_transformer  = module.letter_updates_transformer.function_name
     mi_updates_transformer      = module.mi_updates_transformer.function_name
     supplier_allocator          = module.supplier_allocator.function_name
+    supplier_config_ingress     = module.supplier_config_ingress.function_name
   }
 
   sqs_alarm_targets = {
     sqs_letter_updates          = module.sqs_letter_updates.sqs_queue_name
     amendments_queue            = module.amendments_queue.sqs_queue_name
     letter_status_updates_queue = module.letter_status_updates_queue.sqs_queue_name
     sqs_supplier_allocator      = module.sqs_supplier_allocator.sqs_queue_name
+    sqs_supplier_config         = module.sqs_supplier_config.sqs_queue_name
   }
 }

infrastructure/terraform/components/api/module_lambda_supplier_config_ingress.tf

@@ -66,4 +66,17 @@ data "aws_iam_policy_document" "supplier_config_ingress_lambda" {
       module.sqs_supplier_config.sqs_queue_arn
     ]
   }
+
+  statement {
+    sid    = "AllowConfigDynamoDBWrite"
+    effect = "Allow"
+
+    actions = [
+      "dynamodb:UpdateItem",
+    ]
+
+    resources = [
+      aws_dynamodb_table.supplier-configuration.arn,
+    ]
+  }
 }