feat: add package 'kernel-doc'

tasks/install_packages.yml

@@ -4,7 +4,7 @@
   when: ( ansible_os_family == 'RedHat' ) and
         ( ansible_distribution_major_version == "7" )
 
-- name: install packages required by ExLibris
+- name: install packages required by ExLibris and additional packages
   ansible.builtin.yum:
-    name: "{{ redhat_packages }}"
+    name: "{{ redhat_packages + [ 'kernel-doc' ] }}"
     state: present