microvm guests machine IDs get randomized on each boot #344
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afnix/infra#344
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This causes e.g. journald to think logs from previous boots belong to different machines, and it does not display them by default.
A fixed machine ID can be passed via a DMI OEM option but systemd recommends the machine ID to be secret, so at the very least we should salt our existing 32 bit machine ID with a fixed key.