Wrap a helm [install|upgrade] command to produce an inventory suitable for an intoto attestation

Usage:
  helm-inventory -- [HELM_COMMAND...] [flags]

Flags:
  -h, --help             help for helm-inventory
  -p, --path string      Path where the inventory will be written
  -f, --values strings   Value files to include in the inventory, must match with what's passed to helm.