logging: note that tarring is occurring
logging: note that tarring is occurring

As noted in #1411, this tarring can be particularly expensive so cluing
in the user may help alleviate pain

Connects-to: #1411
Change-type: patch
Signed-off-by: Matthew McGinn <f80d0ca101e967b50b730ddf8e8aca0de85e8df6@balena.io>

resin-io/resin-cli,resin-io/resin-cli,resin-io/resin-cli,resin-io/resin-cli