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

Part of #1000

[skip ci]

Author: php-coder

infra/terraform/README.md

@@ -22,6 +22,9 @@
   $ terraform import digitalocean_record.mx1 my-stamps.ru,<id>
   $ terraform import digitalocean_record.mx2 my-stamps.ru,<id>
   $ terraform import digitalocean_record.email my-stamps.ru,<id>
+  $ terraform import digitalocean_record.spf my-stamps.ru,<id>
+  $ terraform import digitalocean_record.verification my-stamps.ru,<id>
+  $ terraform import digitalocean_record.domain_key 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

@@ -74,3 +74,21 @@ resource "digitalocean_record" "email" {
   name   = "email"
   value  = "mailgun.org."
 }
+resource "digitalocean_record" "verification" {
+  domain = digitalocean_domain.site.name
+  type   = "TXT"
+  name   = "@" # <-- to match the current settings. It's better to use "verification" instead
+  value  = "globalsign-domain-verification=405tmKGIyZt12MvKu_nJV1oCJ_e-MEjf_26bcFQX0t"
+}
+resource "digitalocean_record" "spf" {
+  domain = digitalocean_domain.site.name
+  type   = "TXT"
+  name   = "@" # <-- to match the current settings. It's better to use "spf" instead
+  value  = "v=spf1 include:mailgun.org ~all"
+}
+resource "digitalocean_record" "domain_key" {
+  domain = digitalocean_domain.site.name
+  type   = "TXT"
+  name   = "mx._domainkey"
+  value  = "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLo/TZgHYIM7xrU9dBJCJTTsP90rGhHuyTqSrC3LT+T3vsH5azrz1+9Dm86xz6TpcmrHV1WgmSnw72C++AXstlS8CEg6Z6XVuxMDKsMnMVEWDm1bpESy+h29Ns3kY/EzMTaF1V88ICmr6fSpQIOd9u/lZpsABjfh2wfag1rqWcGwIDAQAB"
+}