Hi all,

If you've worked on the cdimage code, you have probably seen that the code
that downloads the results of a livefs build is pretty complicated. It has
all this knowledge for what the artifacts are called and the paths they
should be downloaded to for long-obsolete series and projects and it turns
out that for all projects we build, we can just download (very nearly) all
artifacts and name them in predictable ways. I've just deployed a change to
do this for devel series builds only.

I've been as careful as I know how to when making these changes, but it's
definitely possible that I've missed something and some plucky builds will
now fail, or, worse, get misbuilt in confusing ways. I hope not (I wrote
code to compare the downloaded paths from the current code with the paths
the simpler approach would download and ran it for a week or so with no
reported differences) but of course I may have made a mistake.

One concrete change from this is that if an artifact fails to download, the
whole build is marked as failed. Previously we could end up in a situation
where a multi-squash ISO (like most installers are now) were simply missing
one of the squasfses -- so this is definitely an improvement.

The plan after letting this code run for a bit is of course to use it for
all series. And then delete all the crazy live_items_paths code!

Cheers,
mwh
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