Replace removed cron task include with include_tasks

[93jun]

Summary

This updates the create-cronjob task entry point to use ansible.builtin.include_tasks instead of the removed bare include action.

Recent ansible-core versions reject include before task execution, so this keeps the role compatible with current Ansible releases.

Validation

• git diff --check

[93jun]

Closing this narrower PR in favor of #75, which now includes both the include_tasks update and the cron package prerequisite in one branch. I re-tested the combined role path in a clean Ubuntu 22.04 container with ansible-core 2.16, and it completed successfully.