[train-only] Set oc_container_cli for checks during ffu

Furing FFWD workflow, the validation gets triggered as part of the
pre-upgrade group. When it gets triggered, the environment is in
state where the Undercloud has been upgrade to OSP16.1 (container
engine is podman) but the Overcloud nodes are still on OSP13
(container engine is still docker).

This patch is similar to I46c4fbe0ef7b281d77bff82483eb0b48b4570bb3
to check which container cli should be used.

Related: https://bugzilla.redhat.com/show_bug.cgi?id=1963872

Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>
Change-Id: I15b105d03193a83ab7bbf3e911cbb37974a54495

roles/container_status/tasks/main.yaml

@@ -1,10 +1,20 @@
 ---
-- name: Set oc_container_cli fact for the Overcloud nodes
-  set_fact:
-    oc_container_cli: "{{ hostvars[inventory_hostname].container_cli | default('podman', true) }}"
-  when:
-    - "'overcloud' in group_names"
-    - oc_container_cli is not defined
+- when: "'overcloud' in group_names"
+  block:
+    - name: Check for docker cli
+      stat:
+        path: "/var/run/docker.sock"
+      register: check_docker_cli
+      check_mode: false
+
+    - name: Set oc_container_cli fact for the Overcloud nodes
+      set_fact:
+        oc_container_cli: |-
+          {% set oc_container_cli = 'podman' %}
+          {%   if check_docker_cli.stat.exists|bool %}
+          {%     set oc_container_cli = 'docker' %}
+          {%   endif %}
+          {{ oc_container_cli }}
 
 - when: "'Undercloud' in group_names"
   block: