.gitlab.yml: missing comments

.gitlab-ci.yml

@@ -37,7 +37,7 @@ variables:
     paths:
       - artifacts/
 
-# This template
+# This template should be usable on any system that's based on apt.
 .apt-template: &apt-template |
       export LC_ALL=C.UTF-8
       echo Etc/UTC > /etc/timezone
@@ -54,6 +54,7 @@ variables:
       apt-get update -qq
       apt-get upgrade -qy
 
+# This template sets us up for Debian system in particular.
 .debian-template: &debian-template
   <<: *artifacts-template
   variables: