Retry on timeouts

For some of the longer running jobs it is sufficient for the service
they interface with to be marginally slower than usual to trigger a
timeout, either in the overall job execution time on on specific
requests from the tools, causing the whole pipeline to fail.

In those case we can afford to retry the job to see if things improve.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

.gitlab-ci.yml

 default:
   interruptible: true
   image: debian:bullseye-slim
+  retry:
+    max: 1
+    when:
+      - job_execution_timeout
+      - script_failure
 
 variables:
   DEBUG:
@@ -358,6 +363,7 @@ pages:
 
 trigger-updates:
   interruptible: false
+  retry: 0
   stage: trigger
   tags:
     - lightweight