ci/lava: set exit code in exception case

Set exit_code to 1 in case of an exception; otherwise,
the job exits with 0, and GitLab shows the job as successful.

Fixes: b9cee06f9e ("ci/lava: handle non-zero exit codes")
Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31556>

.gitlab-ci/lava/utils/lava_job.py

@@ -183,6 +183,9 @@ class LAVAJob:
         self.cancel()
         self.exception = exception
 
+        # Set the exit code to nonzero value
+        self.exit_code = 1
+
         # Give more accurate status depending on exception
         if isinstance(exception, MesaCIKnownIssueException):
             self.status = "canceled"