[XEN PATCH] CI: Fix container build jobs

[Anthony PERARD <anthony@xxxxxxxxxxxxxx>]

From: Anthony PERARD <anthony.perard@xxxxxxxxxx>

`docker:stable` tag hasn't been updated in 5 years, and has been
deprecated, according to https://hub.docker.com/_/docker, while
`docker:dind` (image use for the service) is using a recent version of
docker.

Now, `docker info` fails with:
    Error response from daemon: client version 1.40 is too old. ...

Switch to a newer tag, and just the "cli" version which contains only
the docker client. With that, both `:dind` and `:cli` should keep
using the same version of version. (`:cli` seems to be the base image
used to build `:dind`.)

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---

Notes:
    pipeline:
        
https://gitlab.com/xen-project/people/anthonyper/xen/-/pipelines/2200667790
    which actually pushed the updated containers, despite the name of the
    top commit.

 automation/gitlab-ci/containers.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/automation/gitlab-ci/containers.yaml 
b/automation/gitlab-ci/containers.yaml
index 25e8bdc34b..8b702a1d82 100644
--- a/automation/gitlab-ci/containers.yaml
+++ b/automation/gitlab-ci/containers.yaml
@@ -1,6 +1,6 @@
 .container-build-tmpl:
   stage: containers
-  image: docker:stable
+  image: docker:cli
   tags:
     - container-builder
   rules:
-- 
Anthony PERARD