Move containerd_version to defaults/main.yml (#8379) (#8513)

All container image versions were defined in download/defaults/main.yml
except containerd.
The inconsistency caused the offline script(generate_list.sh) could not
output the URL of containerd image.
This moves the definition into a valid file.
In addition, this adds host_os to generate_list.sh for downloading
krew from a valid URL.

contrib/offline/generate_list.sh

@@ -21,6 +21,7 @@ arch=${ARCH}
 image_arch=${IMAGE_ARCH}
 ansible_system=${ANSIBLE_SYSTEM}
 ansible_architecture=${ANSIBLE_ARCHITECTURE}
+host_os=${ANSIBLE_SYSTEM}
 EOF
 
 # generate all component version by $DOWNLOAD_YML

roles/download/defaults/main.yml

@@ -71,6 +71,10 @@ crun_version: 1.3
 runc_version: v1.0.3
 kata_containers_version: 2.2.3
 gvisor_version: 20210921
+containerd_version: 1.5.8
+
+# this is relevant when container_manager == 'docker'
+docker_containerd_version: 1.4.12
 
 # gcr and kubernetes image repo define
 gcr_image_repo: "gcr.io"

roles/kubespray-defaults/defaults/main.yaml

@@ -340,12 +340,8 @@ docker_plugins: []
 etcd_kubeadm_enabled: false
 
 # Containerd options - thse are relevant when container_manager == 'containerd'
-containerd_version: 1.5.8
 containerd_use_systemd_cgroup: true
 
-# Docker options - this is relevant when container_manager == 'docker'
-docker_containerd_version: 1.4.12
-
 ## An obvious use case is allowing insecure-registry access to self hosted registries.
 ## Can be ipaddress and domain_name.
 ## example define mirror.registry.io or 172.19.16.11:5000