It would be nice if we could monitor the consistency of our ABI from PR to PR,
to ensure there are no inadvertent changes to the library ABI.
Introduce a new CI job that runs the libabigail tools to build an ABI
representation of the PR-built library and compares it to a stored/expected
representation, reporting any discrepancies it finds.
Fixes#22571
Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22589)