Small module that regularly runs btrfs scrub on all btrfs filesystems.
Eventually the module should also do SMART value monitoring, as edwin is
a server from Hetzner's server auction, so a disk failure may not be too
far away.
Change-Id: I11e423a5d91c99ad455c2bb29b632efb79ef908e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7294
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
