Add vBoxStock permissions entrypoint

vboxstock-entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+
+puid="${PUID:-99}"
+pgid="${PGID:-100}"
+
+case "$puid:$pgid" in
+  *[!0-9:]*|:*|*:) echo "PUID and PGID must be numeric." >&2; exit 1 ;;
+esac
+
+mkdir -p "${DATA_DIR:-/data}" "${DATA_DIR:-/data}/backups"
+chown -R "$puid:$pgid" "${DATA_DIR:-/data}"
+
+exec su-exec "$puid:$pgid" "$@"