`sudo systemctl reload caddy` does not work from inside a DooD job
container: `systemctl` is absent from Ubuntu container images and
container processes cannot reach the host systemd without entering its
namespaces. Replace with `docker run --privileged --pid=host ubuntu:22.04
nsenter -t 1 -m -u -n -p -i -- /bin/systemctl reload caddy`, which uses
the already-mounted Docker socket to spin up a privileged sibling
container that enters the host PID namespace via nsenter. Tested live on
the Hetzner VPS. No sudoers entry required.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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