Pass secrets from the host down to internal podman containers

This change will allow RHEL subscriptions from the host to flow to internal containers.

Fixes: containers/common#1735

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

contrib/buildahimage/Containerfile

@@ -65,6 +65,9 @@ RUN dnf -y makecache && \
 
 ADD ./containers.conf /etc/containers/
 
+# Setup internal Buildah to pass secrets/subscriptions down from host to internal container
+RUN printf '/run/secrets:/run/secrets\n' > /etc/containers/mounts.conf
+
 # Copy & modify the defaults to provide reference if runtime changes needed.
 # Changes here are required for running with fuse-overlay storage inside container.
 RUN sed -e 's|^#mount_program|mount_program|g' \