[gjs: 15/16] CI: Use images with buildah and runc preinstalled for image builds

[Philip Chimento <pchimento src gnome org>]

commit e5e202faadb484bbdb58b0a2be2f89f84697d27a
Author: Philip Chimento <philip chimento gmail com>
Date:   Sun Nov 22 12:41:47 2020 -0800

    CI: Use images with buildah and runc preinstalled for image builds
    
    This saves some time when building the monthly images.

 .gitlab-ci.yml | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ca69a21f..1cbd5143 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -332,15 +332,13 @@ zeal_11:
 #          Create CI Docker Images          #
 #############################################
 .Docker image template: &create_docker_image
-  image: registry.fedoraproject.org/fedora:32
+  image: registry.freedesktop.org/freedesktop/ci-templates/x86_64/buildah:2020-10-30.1
   stage: deploy
   only:
     variables:
       - $CRON_TASK == "BUILD_CI_IMAGES"
 
   script:
-    - dnf install -y buildah runc
-
     # Newer versions of podman/buildah try to set overlayfs mount options when
     # using the vfs driver, and this causes errors.
     - sed -i '/^mountopt =.*/d' /etc/containers/storage.conf