[Merge] ~alexghiti/livecd-rootfs:int/alex/riscv_no_beaglev_container into livecd-rootfs:ubuntu/master

[Łukasz Zemczak]

Review: Approve

This is fine - but only if FK_FORCE_CONTAINER=yes is the agreed API for flash-kernel. From what I heard, Dave already +1'd it, right? That seems to be the case by looking at the attached bug at least. Let's merge it.
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https://code.launchpad.net/~alexghiti/livecd-rootfs/+git/livecd-rootfs/+merge/426623
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