[ci] Add debian-12 to matrix in packaging and platform jobs

Author: jozala

.buildkite/pipelines/periodic-packaging.template.yml

@@ -23,6 +23,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
         agents:
           provider: gcp
           image: family/elasticsearch-{{matrix.image}}

.buildkite/pipelines/periodic-packaging.yml

@@ -24,6 +24,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
         agents:
           provider: gcp
           image: family/elasticsearch-{{matrix.image}}

.buildkite/pipelines/periodic-platform-support.yml

@@ -23,6 +23,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
         agents:
           provider: gcp
           image: family/elasticsearch-{{matrix.image}}

.buildkite/pipelines/pull-request/packaging-tests-unix.yml

@@ -26,6 +26,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
             PACKAGING_TASK:
               - docker
               - docker-cloud-ess