Disable coredumps for libvirt pods

The libvirt daemonset running in compute nodes occasionally generates
coredumps during pod termination. This occurs due to a runtime error
raised during the libvirt pod shutdown, causing unnecessary coredumps.

This change explicitly disables coredump generation for libvirt pods
by setting the starlingx.io/core_pattern pod annotation to /dev/null.
This approach prevents unwanted coredump files, reducing resource usage
and log noise.

To re-enable coredump generation for debugging, the annotation can be
overridden by explicitly setting it to null, reverting to the default
coredump handler.

References:
[1] https://docs.starlingx.io/system_configuration/kubernetes/kubernetes-pod-coredump-handler-54d27a0fd2ec.html
[2] https://opendev.org/starlingx/utilities/src/branch/master/utilities/k8s-coredump/k8s-coredump/k8s_coredump

Test Plan:
[PASS] Deploy libvirt helm-chart with modified annotation
[PASS] Verify no coredumps are generated upon pod termination
[PASS] Revert annotation to starlingx.io/core_pattern: null
[PASS] Confirm coredumps generate again as expected

Change-Id: I4584fce97d7c9c45f41534eb1c931fde4fd53497
Signed-off-by: Mateus Nascimento <mateus.soaresdonascimento@windriver.com>

openstack-helm-infra/debian/deb_folder/patches/0022-Add-custom-pod-annotations-to-libvirt.patch

@@ -0,0 +1,28 @@
+From 1dae7d6e8978c1d22a9846730dc5b966aef7a17a Mon Sep 17 00:00:00 2001
+From: Mateus Nascimento <mateus.soaresdonascimento@windriver.com>
+Date: Mon, 24 Mar 2025 14:21:33 -0300
+Subject: [PATCH] Add custom pod annotations to libvirt
+
+This change allows custom annotations to be added to the libvirt pods
+using the static overrides configurations. It follows the recently made
+commits of other OpenStack Helm pods.
+
+---
+ libvirt/templates/daemonset-libvirt.yaml | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/libvirt/templates/daemonset-libvirt.yaml b/libvirt/templates/daemonset-libvirt.yaml
+index 050aefc0..94d2ff05 100644
+--- a/libvirt/templates/daemonset-libvirt.yaml
++++ b/libvirt/templates/daemonset-libvirt.yaml
+@@ -65,6 +65,7 @@ spec:
+ {{ tuple $envAll | include "helm-toolkit.snippets.release_uuid" | indent 8 }}
+         configmap-bin-hash: {{ tuple "configmap-bin.yaml" . | include "helm-toolkit.utils.hash" }}
+         configmap-etc-hash: {{ tuple "configmap-etc.yaml" . | include "helm-toolkit.utils.hash" }}
++{{ tuple "libvirt" . | include "helm-toolkit.snippets.custom_pod_annotations" | indent 8 }}
+         configchecksum: {{ toYaml .Values.labels.isApplication | sha256sum | trunc 63 }}
+     spec:
+ {{ dict "envAll" $envAll "application" "libvirt" | include "helm-toolkit.snippets.kubernetes_pod_security_context" | indent 6 }}
+-- 
+2.34.1
+

openstack-helm-infra/debian/deb_folder/patches/series

@@ -19,3 +19,4 @@
 0019-Fix-upversion-breaking-changes.patch
 0020-removed-section-to-add-default-daemonset-to-global-l.patch
 0021-Bring-necessary-upstream-commits.patch
+0022-Add-custom-pod-annotations-to-libvirt.patch

stx-openstack-helm-fluxcd/stx-openstack-helm-fluxcd/manifests/libvirt/libvirt-static-overrides.yaml

@@ -35,6 +35,10 @@ pod:
       - key: openstack-compute-node
         operator: Exists
         effect: NoSchedule
+annotations:
+  pod:
+    libvirt:
+      starlingx.io/core_pattern: "/dev/null"
 images:
   tags:
     ceph_config_helper: docker.io/openstackhelm/ceph-config-helper:ubuntu_bionic-20201223