stable/ubuntu-20.10 snap channels (lxd, ?) (Re: groovy pre-open analysis)

[Julian Andres Klode]

On Sun, Apr 26, 2020 at 02:17:34PM +0200, Julian Andres Klode wrote:
> I did some work to get python-apt in with groovy added to the
> distribution metadata, so we don't end up with a lot of regressions
> like last cycle.
> 
> * Various packages needed retrying with new debootstrap, as they
>   missed the groovy link:
> 
>   - retried piuparts with [python-apt, debootstrap] triggers  
>   - retried livecd-rootfs with [python-apt, deboostrap] triggers

lxd needs to have a stable/ubuntu-20.10 channel, I guess some other
snaps too, this is currently breaking livecd-rootfs on armhf (the
other ones ran earlier and still downloaded 20.04):

error: cannot download snap "lxd": no snap revision available as specified
If the channel (stable/ubuntu-20.10) includes '*/ubuntu-##.##' track per 
Ubuntu policy (ex. stable/ubuntu-18.04) the publisher will need 
to temporarily create the channel/track to allow fallback during
download (ex. stable/ubuntu-18.04 falls back to stable if the
prior had been created in the past).

I feel like we need to automate more of this stuff.

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