namecheap: make records a dynamic block

namecheap.tf

@@ -5,6 +5,11 @@ variable "caladan-ip" {
   default = "139.162.137.29"
 }
 
+variable "caladan-hostnames" {
+  type = set(string)
+  default = ["@"]
+}
+
 provider "namecheap" {
   user_name = "gthar"
   api_user = "gthar"
@@ -16,9 +21,12 @@ resource "namecheap_domain_records" "monotremata-xyz" {
   domain = "monotremata.xyz"
   mode = "MERGE"  // maybe eventually move to OVERWRITE
 
-  record {
-    hostname = "@"
+  dynamic "record" {
+    for_each = var.caladan-hostnames
+    content {
+      hostname = record.value
       type = "A"
       address = var.caladan-ip
     }
   }
+}