Don't make Docker container copy artifact to a host directory mounted
with -v, because this fails due to a file permission issue:
build is run by a regular user, but the volume directory inside the
container is owned by root.
Instead, make the host copy the artifact from the container.
Also, make the container print the artifact path before that.
Just in case, in order to easily copy file manually, should something
go wrong.
^KT-58864
Allow toolchain builder to add a suffix to toolchain name.
It is useful for rebuilding the same toolchain in different environment.
(cherry picked from commit 83148fc5bb4e8bcc5afcf119df53ec1bc854be17)
Svyatoslav Scherbina