Alpine Linux
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There are several different Alpine versions available. Docker images should probably be based on the Mini Root Filesystem version; Minimal servers should probably be based on the standard ISO, but check the descriptions.
Once the installation disk boots up, a passwordless root user will be
available. Also available will be a setup-alpine script which will allow
for a diskless (ram) data (ram, with disked swap) or sys (‘standard’
install) types of installation.