added task and solution

solution/repack.sh

@@ -0,0 +1,20 @@
+#/usr/bin/env bash
+set -euo pipefail
+
+rm -rf rootfs/*
+cd rootfs
+zstd -cd ../rootfs.cpio.zst | cpio -id
+echo "Unpacked"
+
+cp ../spl/leak_stack .
+echo "Copied leak_stack"
+
+cp ../spl/sploit .
+echo "Copied sploit"
+
+cp ../setuid_fail .
+echo "Copied setuid_fail"
+
+sleep 2
+find . -print0| cpio -H newc --null -o --owner=root:root | zstd -f -19 -o ../rootfs.cpio.zst
+echo "Repacked"