chore: add terraform configuration for NS-type DNS records.

Part of #1000

[skip ci]

Author: php-coder

infra/terraform/README.md

@@ -16,6 +16,9 @@
   $ terraform import digitalocean_domain.site my-stamps.ru
   $ terraform import digitalocean_record.www my-stamps.ru,<id>
   $ terraform import digitalocean_record.no-www my-stamps.ru,<id>
+  $ terraform import digitalocean_record.ns1 my-stamps.ru,<id>
+  $ terraform import digitalocean_record.ns2 my-stamps.ru,<id>
+  $ terraform import digitalocean_record.ns3 my-stamps.ru,<id>
   ```
   The ids can be obtained by API:
   - https://developers.digitalocean.com/documentation/v2/#list-all-droplets

infra/terraform/my-stamps.tf

@@ -36,3 +36,21 @@ resource "digitalocean_record" "www" {
   name   = "www"
   value  = digitalocean_droplet.web.ipv4_address
 }
+resource "digitalocean_record" "ns1" {
+  domain = digitalocean_domain.site.name
+  type   = "NS"
+  name   = "@" # <-- to match the current settings. It's better to use "ns1" instead
+  value  = "ns1.digitalocean.com."
+}
+resource "digitalocean_record" "ns2" {
+  domain = digitalocean_domain.site.name
+  type   = "NS"
+  name   = "@" # <-- to match the current settings. It's better to use "ns2" instead
+  value  = "ns2.digitalocean.com."
+}
+resource "digitalocean_record" "ns3" {
+  domain = digitalocean_domain.site.name
+  type   = "NS"
+  name   = "@" # <-- to match the current settings. It's better to use "ns3" instead
+  value  = "ns3.digitalocean.com."
+}