[Merge] lp:~sil2100/livecd-rootfs/core-series-per-suite into lp:livecd-rootfs

[Łukasz Zemczak]

Łukasz Zemczak has proposed merging lp:~sil2100/livecd-rootfs/core-series-per-suite into lp:livecd-rootfs.

Commit message:
Decide what model assertion series to fetch depending on the suite. Use 16 for xenial and 18 for other series (bionic+). This enables core18 image builds.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~sil2100/livecd-rootfs/core-series-per-suite/+merge/356040

Decide what model assertion series to fetch depending on the suite. Use 16 for xenial and 18 for other series (bionic+). This enables core18 image builds.

The decision to do it per-series comes from actually how cdimage determines what core series to use (with the core_series property). Since cdimage bases it on the distro series, I did the same here. We might think about adding yet another environment variable for this purpose but I would personally not want that. We already have enough parameters we're passing over to livecd-rootfs.

NOTE! It's best not to merge this just yet since apparently there are no official 18 series model assertions in the store yet. I have poked mvo about it.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~sil2100/livecd-rootfs/core-series-per-suite into lp:livecd-rootfs.
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