configure: expose the direct container command

In the process of migrating away from using docker.py to build our
containers we need to expose the command to the build environment. The
script is still a useful way to probe which command works though.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20221011113417.794841-5-alex.bennee@linaro.org>
1 file changed