(periodically) ingest GNU package releases

We have done only a one-off ingestion of GNU package releases (from https://ftp.gnu.org/) back in 2015. We should periodically ingest new GNU package releases, automatic the listing process.

ftp.gnu is now available only via HTTP (and no longer via FTP), but an up-to-date directory listing is available at https://ftp.gnu.org/tree.json.gz (thanks Ludovic Courtès for the heads up on this).

Migrated from T1351 (view on Phabricator)

Edited Jan 08, 2023 by Phabricator Migration user

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