Build the release package for Ubuntu 22.04 Jammy

Summary:
This is the latest LTS version, and having a compatible package has been requested by several users.
LTO has to be disabled otherwise bitcoin-qt segfaults due to some weird Qt incompatibility on the amd46 platform.
I also added my dev key to the gitian signing list because that's what I use for signing the launchpad package.

Test Plan: See the result here: https://launchpad.net/~fabcien/+archive/ubuntu/bitcoin-abc

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D12081