Add ABI testing as part of the CI

[evelikov]

We don't want to cause ABI breakages and manually tracking this is error prone.

Recently I've noticed a few miss placed symbols in the version script [1]. Seemingly those got flagged up in the Debian packaging [2] [3], although the maintainer didn't report that to the kmod team.

Looking through the ABI-laboratory [4], there is one more ABI break.

(Fixes for those will follow shortly, doing some auditing atm Sent: https://lore.kernel.org/linux-modules/[email protected]/T/#t)

Fedora/RH [5] already uses abi-lab/libabigail and they have some handy blog posts [5][6]. Some of the Gnome projects also make use of libabigail.

[1] https://lore.kernel.org/linux-modules/[email protected]/T/#t
[2] https://salsa.debian.org/md/kmod/-/commit/e5c3f7cc04ac523a66ad8a2cd8cbc04b51d55391
[3] https://salsa.debian.org/md/kmod/-/commit/c7c9dd68adba0aeac53b9402ca1f278d43c62988
[4] https://abi-laboratory.pro/index.php?view=timeline&l=kmod
[5] https://developers.redhat.com/blog/2020/04/02/how-to-write-an-abi-compliance-checker-using-libabigail
[6] https://developers.redhat.com/articles/2022/01/06/whats-new-libabigail-20#