ci: Make all job timeouts explicit

Enforce a default job timeout of 1 second, to make jobs which don't
explicitly specify a timeout insta-fail, rather than potentially hanging
around for an hour.

Container builds get the full hour as they can run long and are not run
in pre-merge context, and LAVA jobs also get the full hour as they have
multiple internal timeout mechanisms which aim to fast-fail jobs once
they actually start. However, as they just queue jobs to an external
host (shared with other projects like KernelCI), these timeouts aren't
reflected into the GitLab CI definitions.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34280>

.gitlab-ci.yml

@@ -124,6 +124,7 @@ variables:
   DATA_STORAGE_PATH: data_storage
 
 default:
+  timeout: 1m # catch any jobs which don't specify a timeout
   id_tokens:
     S3_JWT:
       aud: https://s3.freedesktop.org