Support day and month in cron tasks

[gregharvey]

See the module:

• https://docs.ansible.com/ansible/latest/collections/ansible/builtin/cron_module.html

At the moment our role assumes we only need to set minute or hour - we should make it a bit more flexible and include day and month options. For example:

• https://github.com/codeenigma/ce-deploy/blob/1.x/roles/cron/cron_drupal8/tasks/job.yml#L27

[gregharvey]

This was done already.