CI: Replace CentOS 8 with AlmaLinux 8 before CentOS 8 EOL end of 2021 (#8297) (#8514)

Co-authored-by: Cristian Calin <6627509+cristicalin@users.noreply.github.com>

roles/container-engine/containerd/molecule/default/molecule.yml

@@ -23,8 +23,8 @@ platforms:
       - kube_control_plane
       - kube_node
       - k8s_cluster
-  - name: centos8
-    box: generic/centos8
+  - name: almalinux8
+    box: almalinux/8
     cpus: 1
     memory: 1024
     groups:

roles/container-engine/cri-o/molecule/default/molecule.yml

@@ -19,8 +19,8 @@ platforms:
     memory: 1024
     groups:
       - kube_control_plane
-  - name: centos8
-    box: centos/8
+  - name: almalinux8
+    box: almalinux/8
     cpus: 2
     memory: 1024
     groups:

roles/container-engine/docker/molecule/default/molecule.yml

@@ -7,10 +7,14 @@ lint: |
   set -e
   yamllint -c ../../../.yamllint .
 platforms:
-  - name: kubespray-docker
+  - name: ubuntu18
     box: generic/ubuntu1804
     cpus: 2
     memory: 1024
+  - name: almalinux8
+    box: almalinux/8
+    cpus: 2
+    memory: 1024
 provisioner:
   name: ansible
   env:

roles/container-engine/gvisor/molecule/default/molecule.yml

@@ -16,8 +16,8 @@ platforms:
     nested: true
     groups:
       - kube_control_plane
-  - name: centos8
-    box: generic/centos8
+  - name: almalinux8
+    box: almalinux/8
     cpus: 1
     memory: 1024
     nested: true