Enable gitlab pages

Fixes #228 (closed) and supersedes !163 (closed). Enables easy resolving of #61 (closed).

The test page is online at https://test.archlinux.org/. Its project is here: https://gitlab.archlinux.org/svenstaro/pages-test/pages It uses the GitLab built-in Let's Encrypt integration.

Changes are already rolled out.

Upon inspection and merging, the reviewer must:

• Remove hetznerdns_record.gitlab_pages_test_* from archlinux.tf and run terraform apply
• Remove the project https://gitlab.archlinux.org/svenstaro/pages-test

tf-stage1/archlinux.tf

@@ -1087,27 +1087,6 @@ variable "gitlab_pages_ipv6" {
   default = "2a01:4f8:c2c:5d2d::2"
 }
 
-resource "hetznerdns_record" "gitlab_pages_test_a" {
-  zone_id = hetznerdns_zone.archlinux.id
-  name    = "test"
-  value   = hcloud_floating_ip.gitlab_pages.ip_address
-  type    = "A"
-}
-
-resource "hetznerdns_record" "gitlab_pages_test_aaaa" {
-  zone_id = hetznerdns_zone.archlinux.id
-  name    = "test"
-  value   = var.gitlab_pages_ipv6
-  type    = "AAAA"
-}
-
-resource "hetznerdns_record" "gitlab_pages_test_verification" {
-  zone_id = hetznerdns_zone.archlinux.id
-  name    = "_gitlab-pages-verification-code.test"
-  value   = "\"gitlab-pages-verification-code=04ee0a6d7284e43a85bee57bf401bb03\""
-  type    = "TXT"
-}
-
 resource "hcloud_volume" "gitlab" {
   name      = "gitlab"
   size      = 1000