Makes the build fail, on some condition.

fix #3434

This way, this will use either the docker or the podman runners.

The other steps still use only docker, because I didn’t solve the cache
issue on podman yet.

Fix #3431

Fix #3431

This reverts commit 1492eed3.

Fix #3429

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

Because we actually don’t change the nick, we ignore it, just like in the
case of a normal join (of an other resource, or an other channel on the same
server).

fix #3419

As required by XEP 0359

Should fix #3369