By setting the `desired_package_state` variable we can change if ansible
should only ensure that the packages exist on the system (`present`) or
that they are also updated to their latest version (`latest`).
Restic backup creates a snapper snapshot of the root system which it
then chroots into and starts a restic backup to a (wasabi) S3 bucket to.
Intended to roughly follow this
<https://codeberg.org/silmaril/my-restic-solution> solution to achieve
restic backup of the _newest_ snapshot of my live root system.
