bug#47336: Disarchive as a fallback for downloads

reassign 47336 guix-patches thanks Oops! I sent this to the wrong list. My apologies.

bug#47336: Disarchive as a fallback for downloads

Hello, This patch series adds Disarchive assembly (backed by SWH lookup) as a fallback for downloads. To try it, make sure you are running the daemon in an environment with Disarchive available: $ ./pre-inst-env guix environment --ad-hoc guile disarchive # ./pre-inst-env guix-daemon