Rocky Linux support (#8095)

* Add Rocky as a known OS

* Make sure Rocky includes bootstrap-centos.yml

* Update docs with Rocky Linux

* Rocky Linux wireguard and EPEL

* Rocky Linux in the list of supported distributions

roles/bootstrap-os/tasks/main.yml

@@ -7,7 +7,7 @@
   check_mode: false
 
 - include_tasks: bootstrap-centos.yml
-  when: '''ID="centos"'' in os_release.stdout_lines or ''ID="ol"'' in os_release.stdout_lines or ''ID="almalinux"'' in os_release.stdout_lines'
+  when: '''ID="centos"'' in os_release.stdout_lines or ''ID="ol"'' in os_release.stdout_lines or ''ID="almalinux"'' in os_release.stdout_lines or ''ID="rocky"'' in os_release.stdout_lines'
 
 - include_tasks: bootstrap-amazon.yml
   when: '''ID="amzn"'' in os_release.stdout_lines'

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

@@ -15,7 +15,7 @@
   fail:
     msg: "{{ ansible_distribution }} is not supported by containerd."
   when:
-    - not ansible_distribution in ["CentOS", "OracleLinux", "RedHat", "Ubuntu", "Debian", "Fedora", "AlmaLinux", "Amazon", "Flatcar", "Flatcar Container Linux by Kinvolk"]
+    - not ansible_distribution in ["CentOS", "OracleLinux", "RedHat", "Ubuntu", "Debian", "Fedora", "AlmaLinux", "Rocky", "Amazon", "Flatcar", "Flatcar Container Linux by Kinvolk"]
 
 - name: gather os specific variables
   include_vars: "{{ item }}"

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

@@ -24,7 +24,7 @@
 
 - name: Stop if unknown OS
   assert:
-    that: ansible_distribution in ['RedHat', 'CentOS', 'Fedora', 'Ubuntu', 'Debian', 'Flatcar', 'Flatcar Container Linux by Kinvolk', 'Suse', 'openSUSE Leap', 'ClearLinux', 'OracleLinux', 'AlmaLinux', 'Amazon']
+    that: ansible_distribution in ['RedHat', 'CentOS', 'Fedora', 'Ubuntu', 'Debian', 'Flatcar', 'Flatcar Container Linux by Kinvolk', 'Suse', 'openSUSE Leap', 'ClearLinux', 'OracleLinux', 'AlmaLinux', 'Rocky', 'Amazon']
     msg: "{{ ansible_distribution }} is not a known OS"
   when: not ignore_assert_errors