do not remove package in validate container engine role when Fedora CoreOS distr (#8626)

roles/container-engine/validate-container-engine/tasks/main.yml

 ---
+- name: validate-container-engine | check if fedora coreos
+  stat:
+    path: /run/ostree-booted
+    get_attributes: no
+    get_checksum: no
+    get_mime: no
+  register: ostree
+
+- name: validate-container-engine | set is_ostree
+  set_fact:
+    is_ostree: "{{ ostree.stat.exists }}"
+
 - name: Ensure kubelet systemd unit exists
   stat:
     path: "/etc/systemd/system/kubelet.service"
@@ -64,6 +76,7 @@
           tags:
             - reset_containerd
   when:
+    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
     - container_manager != "containerd"
     - docker_installed.matched == 0
     - containerd_installed.matched > 0
@@ -89,6 +102,7 @@
           tags:
             - reset_docker
   when:
+    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
     - container_manager != "docker"
     - docker_installed.matched > 0
 
@@ -113,5 +127,6 @@
           tags:
             - reset_crio
   when:
+    - not (is_ostree or (ansible_distribution == "Flatcar Container Linux by Kinvolk") or (ansible_distribution == "Flatcar"))
     - container_manager != "crio"
     - crio_installed.matched > 0