diff --git a/wrapper/start.sh b/wrapper/start.sh
new file mode 100644
index 0000000..b98a287
--- /dev/null
+++ b/wrapper/start.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Ensure default dirs exist
+mkdir -p /cache/app /cache/tmp /cache/prev /data
+
+exec python -u /wrapper/wrapper.py