move to deb822 sources in ubuntu:lunar docker image

[Julian Andres Klode]

On Thu, Jan 12, 2023 at 05:54:03PM +0100, Julian Andres Klode wrote:
> (resend with proper subject, sigh, mutt mishaps)
> 
> As part of deb822 sources file enablement, the specification
> states a MVP for 23.04 to move sources.list to sources.list.d/
> ubuntu.sources (in deb822 format obviously) inside Docker images.

The specification: https://discourse.ubuntu.com/t/spec-apt-deb822-sources-by-default/29333

Thanks Robie for notifying me I forgot to include that.

Making mistakes at the end of hyper productive days :)
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