Update main.yml

    : TASK [geerlingguy.packer-rhel : Clean up yum.] *********************************
    :  [WARNING]: Consider using yum module rather than running yum

To suppress this warning, a workaround can be applied via a notification handler as per documentation[1]. Reasoning for s/workaround/hack/ can be found in [2]'s last comment.

[1] https://docs.ansible.com/ansible/2.4/yum_repository_module.html
[2] ansible/ansible#31450

tasks/main.yml

@@ -76,16 +76,20 @@
 - include_tasks: vmware.yml
   when: vmware_check.rc == 0
 
-# Cleanup tasks.
+# Handler for 'yum clean all' command whichs in effect runs yum clean packages and yum clean headers
+- name: yum-clean-all
+  command: yum clean all
+  args:
+    warn: no
+
+# Cleanup tasks
 - name: Remove unneeded packages.
   yum: "name={{ item }} state=absent"
   with_items:
     - cpp
     - kernel-devel
     - kernel-headers
-
-- name: Clean up yum.
-  command: yum clean all
+  notify: yum-clean-all
 
 - name: Remove any remnants of VirtualBox ISOs.
   shell: rm -rf VBoxGuestAdditions_*.iso VBoxGuestAdditions_*.iso.?