Include the size of the `machine-id` file, but not the value itself as
that is sensitive for non-throwaway machines. What’s most useful for
debugging CI problems is knowing whether, and where, the `machine-id` is
set.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This will help to debug CI issues that are related to us running in
a container that might have unusual capabilities, mount points,
filesystems etc., such as (probably) #2027, #2028, #2029.
Signed-off-by: Simon McVittie <smcv@collabora.com>
