message: fix: don't touch the sentinel file if it already exists
  The sentinel file only needs to be touched once, not every time the
  initContainer runs.
diff: @@ -49,8 +49,8 @@ spec:
  find /storage -mindepth 1 -exec chgrp $(stat -c "%g" /storage) {} +
  find /storage -mindepth 1 -exec chmod g+rw {} +
  find /storage -mindepth 1 -type d -exec chmod g+x {} +
  - fi
  touch "$SENTINEL"
  + fi
  image: busybox:musl
  imagePullPolicy: IfNotPresent
  name: fix-storage-permissions
  