[babl/barthalion/ci-fix] ci: Unbreak archlinux-based CI

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 5ad71f898c3be447541c7586819f6374a70abc8c
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Fri Feb 19 10:40:48 2021 +0100

    ci: Unbreak archlinux-based CI
    
    Recently Arch has changed its glibc package to require kernel
    4.4[1] as a poor man's attempt to disable faccessat2 syscall that
    is known to cause problems with old libseccomp and Docker. Downgrade
    glibc to the pkgrel before the change and ensure it's not upgraded.
    
    Additionally switch to the official Arch Linux image in the library
    namespace. The base image has been deprecated.
    
    [1] https://github.com/archlinux/svntogit-packages/commit/893b1c268abc8822332655865e3d4546025a9b4b

 .gitlab-ci.yml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f98bb7b71..fc3dc5e83 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ cache:
 
 .build:
   stage: build
-  image: archlinux/base:latest
+  image: archlinux:latest
   variables:
     PACMAN_CACHE: $CI_PROJECT_DIR/_pacman_cache
   artifacts:
@@ -12,7 +12,8 @@ cache:
     paths:
       - _build/meson-logs
   before_script:
-    - pacman -Syu --noconfirm --needed --cachedir $PACMAN_CACHE
+    - pacman -U https://archive.archlinux.org/packages/g/glibc/glibc-2.33-3-x86_64.pkg.tar.zst
+    - pacman -Syu --noconfirm --needed --cachedir $PACMAN_CACHE --ignorepkg glibc
         base-devel
         git
         gobject-introspection