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

Author: jozala

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

@@ -18,6 +18,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
         agents:
           provider: gcp
           image: family/elasticsearch-{{matrix.image}}

.buildkite/pipelines/periodic-packaging.yml

@@ -19,6 +19,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
         agents:
           provider: gcp
           image: family/elasticsearch-{{matrix.image}}

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

@@ -18,6 +18,7 @@ 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

@@ -21,6 +21,7 @@ steps:
               - rhel-8
               - rhel-9
               - almalinux-8
+              - almalinux-9
             PACKAGING_TASK:
               - docker
               - docker-cloud-ess