Releng: make test logs and results in GitHub accessible
Releng: make test logs and results in GitHub accessible

When a GitHub CI build fails, the maven output often only shows an
exception. Store the test logs as artifacts in failed builds, so that
they can be downloaded and examined.

This should help figuring out why some tests fail sometimes in the
GitHub CI builds.
apache/mina-sshd,apache/mina-sshd,apache/mina-sshd,apache/mina-sshd