question: crane mutate/append with local tarball as a base image

[dudicoco]

Hi,

I'm trying to append or mutate a local tar:

crane mutate node.tar \
  --append "$tar" \
  --output "$image" \
  --tag "$project" \
  --cmd "./src/index.js"

And i'm getting the following error:

Error: pulling node.tar: parsing reference "node.tar": could not parse reference: node.tar

I want to use a local tar since am pulling the base image beforehand in order to cache the layers (it's not possible to cache with crane mutate/append):

crane pull "$base" "node.tar" --cache_path cache