[gimp-help/wip/Jehan/fix-ci] gitlab-ci: install Python3 and Python3-libxml2.

[Jehan <jehanp src gnome org>]

commit ced774986595a7a47b4764e8b95ba6033bc066ae
Author: Jehan <jehan girinstud io>
Date:   Mon Jun 14 21:02:55 2021 +0200

    gitlab-ci: install Python3 and Python3-libxml2.

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00174a7c9..1a61035fa 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -24,6 +24,8 @@ build-debian:
         pkg-config
         pngcrush
         pngnq
+        python3
+        python3-libxml2
         xsltproc
   script:
     - mkdir _build