Include btrfsmaintenance Debian package in Freedombox

[joseph]

@problema I posted the wrong link. This one is how to set up btrfsmaintenance.

BTRFS Filesystem Maintenance Automation with btrfsmaintenance Package

btrfsmaintenance This post covers setup of the btrfsmaintenance package to automate sensible and recommended filesystem maintenance tasks of the btrfs filesystem. The common use case covered here is a single btrfs root filesystem mounted at /. This is the expected use case which allows a user to use the Storage Snapshots app built into Freedombox. A user using a more complex btrfs configuration such as a non-root btrfs or multiple btrfs filesystems is expected to be able to adapt these notes to …