[gegl] ci: unbreak archlinux-based CI

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 939c4c1e2209318fef32c69f1ddaa320c07562ba
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Feb 20 09:23:28 2021 +0100

    ci: unbreak archlinux-based CI
    
    Downgrade glibc to the pkgrel before arch linux made it depend on linux
    kernel 4.4 [1], and ensure it's not upgraded - following the lead of
    babl.
    
    https://github.com/archlinux/svntogit-packages/commit/893b1c268abc8822332655865e3d4546025a9b4b

 .gitlab-ci.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ff76a0d0b..0f5a9a8c3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,7 +27,8 @@ build-image:
     - mkdir -p /kaniko/.docker
     - echo 
"{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" 
> /kaniko/.docker/config.json
     - echo "FROM archlinux/base:latest" > Dockerfile
-    - echo "RUN pacman -Syu --noconfirm --needed git base-devel ccache meson lcms2 gobject-introspection 
vala && pacman -Scc --noconfirm " >> Dockerfile
+    - echo "RUN pacman -U --noconfirm 
https://archive.archlinux.org/packages/g/glibc/glibc-2.33-3-x86_64.pkg.tar.zst " >> Dockerfile
+    - echo "RUN pacman -Syu --noconfirm --ignore glibc --needed git base-devel ccache meson lcms2 
gobject-introspection vala pacman-contrib && pacman -Scc --noconfirm " >> Dockerfile
 
     - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination 
$CI_REGISTRY_IMAGE:ci-latest --cache=true --cache-ttl=120h
 
@@ -40,7 +41,8 @@ build-image:
     GIT_DEPTH: "5"
     CCACHE_MAXSIZE: "32Mi"
   before_script:
-    - pacman -Syu --noconfirm --needed git base-devel ccache meson lcms2 gobject-introspection vala
+    - pacman -U --noconfirm https://archive.archlinux.org/packages/g/glibc/glibc-2.33-3-x86_64.pkg.tar.zst
+    - pacman -Syu --ignore glibc --noconfirm --needed git base-devel ccache meson lcms2 
gobject-introspection vala
     - git clone --depth=$GIT_DEPTH https://gitlab.gnome.org/GNOME/babl.git _babl
     - cd _babl
     - ccache -z