Add sleep script as a workaround to save a Docker image

It will be used to start the container "sleeping", so that we can use
docker export and extract a rootfs from it.

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>

diff --git a/dockerfiles/sleep b/dockerfiles/sleep
new file mode 100644 (file)
index 0000000..03f26ac
--- /dev/null
+++ b/dockerfiles/sleep
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+/bin/sleep 60
+