add containerd on fedora CoreOS (#7794)

* set selinux type t_etc if selinux state is enforcing

* workaround with update repo is no longer needed
remove comments about failing playbook

* grubby is not available in distros using ostree

* remove docker support because removed in fcos
update install script example with live rootfs

* do not call grubby on ostree based distro

* update docs enabling containerd on fedora coreos

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

@@ -43,6 +43,7 @@
     - ansible_distribution == "Fedora"
     - (ansible_distribution_major_version | int) >= 31
     - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+    - not is_ostree
 
 - name: reboot in Fedora 31+
   reboot:
@@ -50,6 +51,7 @@
     - ansible_distribution == "Fedora"
     - (ansible_distribution_major_version | int) >= 31
     - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+    - not is_ostree
 
 - include_tasks: containerd_repo.yml
   when: not is_ostree

roles/container-engine/cri-o/tasks/main.yaml

@@ -34,6 +34,7 @@
     - ansible_distribution == "Fedora"
     - (ansible_distribution_major_version | int) >= 31
     - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+    - not is_ostree
 
 - name: reboot in Fedora 31+
   reboot:
@@ -41,6 +42,7 @@
     - ansible_distribution == "Fedora"
     - (ansible_distribution_major_version | int) >= 31
     - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+    - not is_ostree
 
 - name: import crio repo
   import_tasks: "crio_repo.yml"