[glade-web] ci: Switch to Debian

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 7f1c3f63c76f649a7f41ba9809830d3af4bb937a
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Fri Apr 15 10:45:38 2022 +0200

    ci: Switch to Debian

 .gitlab-ci.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3655ba9..69e4e64 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,8 +1,10 @@
-image: centos:7
+image: debian:bullseye
 
 pages:
   script:
-    - yum install -y make bzip2 wget
+    - apt-get update
+    - apt-get install -y make wget bzip2 python2
+    - ln -s /usr/bin/python2 /usr/bin/python
     - make WEBDIR=public
   artifacts:
     paths: