feat: Added DNS control to tofu

infra/modules/dns/main.tf

@@ -0,0 +1,28 @@
+# One Hetzner DNS zone per domain in var.zone_names. Hetzner becomes
+# authoritative for these once the domain's registrar NS records are pointed at
+# the nameservers in the `nameservers` output - that step happens at whichever
+# registrar the domain was bought through, and can't be done from here.
+resource "hcloud_zone" "this" {
+  for_each = toset(var.zone_names)
+
+  name              = each.value
+  mode              = "primary"
+  delete_protection = true # API-level guard, in addition to prevent_destroy below
+
+  lifecycle {
+    prevent_destroy = true
+  }
+}
+
+resource "hcloud_zone_rrset" "a" {
+  for_each = { for r in var.records : "${r.zone}/${r.name}" => r }
+
+  zone = hcloud_zone.this[each.value.zone].id
+  name = each.value.name
+  type = "A"
+  ttl  = each.value.ttl
+
+  records = [
+    { value = each.value.value }
+  ]
+}