We've had a lot of issues with alpine and currently there's a broken
network issue on alpine for users running on RPI arm32 architechture
which requires a workaround before docker is able to sync time between
the host and the container: https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.13.0\#time64_requirements.
Since we're switching the base image of the storagenode to debian,
it's best to switch the base image of all our docker images to
debian as well for consistency; less drift across them and keeps
the push target consistent.
Change-Id: If3adf7a57dc59f19ef2221b892f340d919798fc5
e486585853