KiCad Docker - Bookworm Image phase out

[Mark Roszko]

With Debian 13 Trixie being released, the bookworm images will be gradually phased out.

KiCad 9.0 docker images will continue to ship bookworm images under the "base version label" of 9.0 for the duration of the maintenance period.

KiCad 10.0 docker images will ship built on trixie only.

KiCad nightly docker images are currently available as both trixie and bookworm images. 

Trixie images are suffixed with -trixie while bookworm has no suffix.

On December 1st, the bookworm images will be replaced by trixie.