[PATCH] automation: enable UBSAN for debug tests

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

automation: enable UBSAN for debug tests

Enable CONFIG_UBSAN and CONFIG_UBSAN_FATAL for the ARM64 and x86_64
build jobs, with debug enabled, which are later used for Xen tests on
QEMU and/or real hardware.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
successful pipeline: 
https://gitlab.com/xen-project/people/sstabellini/xen/-/pipelines/1657961377

diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index bc4a8a5ad2..fb55d4ce55 100644
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -333,6 +333,8 @@ alpine-3.18-gcc-debug:
       CONFIG_EXPERT=y
       CONFIG_UNSUPPORTED=y
       CONFIG_ARGO=y
+      CONFIG_UBSAN=y
+      CONFIG_UBSAN_FATAL=y
 
 debian-12-x86_64-gcc-debug:
   extends: .gcc-x86-64-build-debug
@@ -419,6 +421,9 @@ alpine-3.18-gcc-debug-arm64:
   extends: .gcc-arm64-build-debug
   variables:
     CONTAINER: alpine:3.18-arm64v8
+    EXTRA_XEN_CONFIG: |
+      CONFIG_UBSAN=y
+      CONFIG_UBSAN_FATAL=y
 
 alpine-3.18-gcc-arm64-randconfig:
   extends: .gcc-arm64-build