Himmelblau installs Intune Linux custom configuration scripts as
/etc/cron.d jobs, and the image had no cron, so a script policy failed to
apply. Add cronie and enable crond.
Add a custom configuration script that repairs Microsoft Defender on its
schedule: finishes first-boot setup, restarts a stopped daemon, onboards with
the tenant's mdatp_onboard.json (pasted into the script in Intune), and
re-enables real-time protection and updates definitions when needed.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>