pkg-ubuntu: add build pipeline Ubuntu 22.04, 24.04

This commit add necessary files for building debian .deb package and
shell script to build for Ubuntu 22.04 and 24.04. You can use it by
running `extras/packaging/build_packages.sh` script.

Change-Id: I91ba97cbe932ff4207072dcb2f9d2b2887de236a
diff --git a/extras/packaging/gnu-linux/debian/README.Debian b/extras/packaging/gnu-linux/debian/README.Debian
new file mode 100644
index 0000000..317fe21
--- /dev/null
+++ b/extras/packaging/gnu-linux/debian/README.Debian
@@ -0,0 +1,17 @@
+DHTNet - Lightweight Peer-to-Peer Communication Library
+
+DHTNet is a C++17 library designed to serve as a network overlay that provides an IP network abstraction. Its main objective is to establish secure peer-to-peer connections using public-key authentication.
+Dhtnet allows you to connect with a device simply by knowing its public key and efficiently manages peer discovery and connectivity establishment, including NAT traversal.
+
+Features:
+
+- Connection Management:
+    DHTNet simplifies the establishment and management of connections to peers, streamlining the communication process.
+- Multiplexed Sockets:
+    It provides multiplexed sockets that allow multiple channels for data transmission, optimizing network resources.
+- UPnP Integration:
+    DHTNet seamlessly integrates with UPnP, enabling automatic port mapping and enhanced network connectivity.
+- Server TURN Support:
+    DHTNet includes support for server TURN, used as a fallback for connections if the NAT block all possible connections.
+
+ -- Louis Maillard <louis.maillard@savoirfairelinux.com>  Wed, 17 Jul 2024 09:27:39 -0400