Deb package for fake udev library

[PMohanJ]

Reference the issue numbers and reviewers
@ehfd @thelamer

Explain relevant issues and how this pull request solves them
This PR aims to integrate joystick interposer into example containe by incorporating recent changes to fake-udev library.

Describe the changes in code and its dependencies and justify that they work as intended after testing
Changes to fake-udev component for 32bit arch (for amd64) build, packaging the library to debain package, updating entryfiles to reflect these modifications.

Describe alternatives you've considered
NA

Additional context
NA

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[Copilot]

Pull request overview

This PR adds Debian packaging support for the fake-udev addon (including optional 32-bit builds on amd64) and updates the example container to install and preload the fake libudev alongside the joystick interposer.

Changes:

• Add fake-udev deb packaging via a build.sh script and a new Dockerfile.debpkg.
• Extend fake-udev Makefile to support 32-bit builds (all32) on amd64.
• Update example entrypoints and Dockerfile to install the fake-udev deb and add it to LD_PRELOAD, plus create /dev/input device nodes.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
addons/fake-udev/build.sh	New script to build and package fake-udev into a .deb (and optionally include i386 build on amd64).
addons/fake-udev/Makefile	Makefile updates to allow overriding LIB_VERSION and add 32-bit build targets.
addons/fake-udev/Dockerfile.debpkg	New build image to produce the .deb/.tar.gz artifacts for fake-udev.
addons/example/selkies-entrypoint.sh	Preload fake libudev alongside the joystick interposer.
addons/example/entrypoint.sh	Preload fake libudev and create joystick + event device nodes.
addons/example/Dockerfile	Install fake-udev deb from an external build image stage.

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[ehfd]

I think many of the Copilot reviews are irrelevant, but a few, I think it's relevant.

[PMohanJ]

@ehfd addressed the comments that felt relevant.