[OE-core] read only rootfs?

[Cliff Brake]

Hello,

What are the best practices for implementing a read-only rootfs built
with OE?  I've looked at a few things like poky-tiny.conf, but figured
I would ask.

To date, I've been cheating and implementing a tmpfs overlay on top a
RO rootfs using unionfs, but this is less than idea as you need to do
the package install process on every boot.  Others boot the first time
RW, and then switch to RO for subsequent boots.

Thanks,
Cliff

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