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>
diff --git a/configure b/configure
index 45ee6f4..5484ed2 100755
--- a/configure
+++ b/configure
@@ -1778,6 +1778,7 @@
 # functions to probe cross compilers
 
 container="no"
+runc=""
 if test $use_containers = "yes"; then
     case $($python "$source_path"/tests/docker/docker.py probe) in
         *docker) container=docker ;;
@@ -1786,6 +1787,7 @@
     esac
     if test "$container" != "no"; then
         docker_py="$python $source_path/tests/docker/docker.py --engine $container"
+        runc=$($python "$source_path"/tests/docker/docker.py probe)
     fi
 fi
 
@@ -2380,6 +2382,7 @@
 
 if test "$container" != no; then
     echo "ENGINE=$container" >> $config_host_mak
+    echo "RUNC=$runc" >> $config_host_mak
 fi
 echo "ROMS=$roms" >> $config_host_mak
 echo "MAKE=$make" >> $config_host_mak