refactor: update cronjob template

Description

This MR adds the possibility to run Kubernetes-based cron jobs. This is not capable of running any custom scripts (unless the script is packaged with the docker image).

Supporting information

https://tasks.opencraft.com/browse/SE-5878

Testing instructions

Steps to test the changes:

1. Check that cron jobs are green: https://cloud.digitalocean.com/kubernetes/clusters/ba4c9867-e72c-4ce7-b7df-98f01e3a481b/db/e665a52d-b474-4257-b9f9-f553cd2a8f57/#/cronjob?namespace=gabor-test
2. Check that pipeline is green https://gitlab.com/opencraft/ops/grove-stage-digitalocean/-/jobs/3690434404
3. Check the kubernetes output of:

   ❯ kubectl get cronjob -A
   NAMESPACE    NAME                    SCHEDULE       SUSPEND   ACTIVE   LAST SCHEDULE   AGE
   gabor-test   cron-job-diffsettings   */10 * * * *   False     1        2m53s           8m18s
   gabor-test   cron-job-hello-world    */20 * * * *   False     1        2m53s           8m18s

Dependencies

N/A

Screenshots

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• Git commit history is clean
• Git commits are following conventional-commit practices
• Unit tests are added/updated
• Documentation is added/updated

Additional context

N/A