Add GitLab Pages for alpm

Requested by Orhun[1].

[1] archlinux/alpm/alpm!9

roles/prometheus/defaults/main.yml

@@ -29,6 +29,7 @@ blackbox_targets:
 
     # regenerate the list below with: ./misc/find-arch-on-crt.sh targets
     - https://accounts.archlinux.org
+    - https://alpm.archlinux.page/alpm_buildinfo/
     - https://alpm-types.archlinux.page/alpm_types/
     - https://america.archive.pkgbuild.com
     - https://america.mirror.pkgbuild.com

tf-stage1/archlinux.tf

@@ -194,6 +194,7 @@ locals {
     "monthly-reports" = "a2d60657e960b480cdb229df7cc7edf3"
     "alpm-types"      = "610659aa8df9c0d8e4b1b7bb905ea2e3"
     "pacman"          = "3c5fb9413c1d66dac516a08277575662"
+    "alpm"            = "363d06e0957fbfd22403e4dd992afc48"
   }
 
   # This creates archlinux.org TXT DNS entries