images: force buildah to use runc

buildah 1.19.4 and its dependencies when installed from the
libcontainers OBS repo, defaulted to crun and that made the
image builds to fail.

By forcing buildah to use runc instead, everything works OK.

Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>

Author: mythi

build/docker/build-image.sh

@@ -32,7 +32,7 @@ fi
 if [ -z "${BUILDER}" -o "${BUILDER}" = 'docker' ] ; then
     docker build --pull -t ${IMG}:${TAG} ${BUILD_ARGS} -f ${DOCKERFILE} .
 elif [ "${BUILDER}" = 'buildah' ] ; then
-    buildah bud --pull-always -t ${IMG}:${TAG} ${BUILD_ARGS} -f ${DOCKERFILE} .
+    BUILDAH_RUNTIME=runc buildah bud --pull-always -t ${IMG}:${TAG} ${BUILD_ARGS} -f ${DOCKERFILE} .
 else
     (>&2 echo "Unknown builder ${BUILDER}")
     exit 1