tf-stage1: Add GitLab Pages for Signstar

Requested by dvzrv[1] and implemented in this MR[2].

[1]: archlinux/signstar#91
[2]: archlinux/signstar!125



Signed-off-by: Christian Heusel <christian@heusel.eu>

roles/prometheus/defaults/main.yml

@@ -78,6 +78,7 @@ blackbox_targets:
     - https://reproducible.archlinux.org
     - https://rfc.archlinux.page
     - https://security.archlinux.org
+    - https://signstar.archlinux.archlinux.page/nethsm/
     - https://sources.archlinux.org
     - https://static.conf.archlinux.org/README.md
     - https://sydney.mirror.pkgbuild.com

tf-stage1/archlinux.tf

@@ -182,6 +182,7 @@ locals {
     "monthly-reports" = "a2d60657e960b480cdb229df7cc7edf3"
     "pacman"          = "3c5fb9413c1d66dac516a08277575662"
     "alpm"            = "363d06e0957fbfd22403e4dd992afc48"
+    "signstar"        = "5c348888c16d81166379017879a29fe3"
   }
 
   # This creates archlinux.org TXT DNS entries