crane: mutate to set empty entrypoint does not work

[pstoeckle]

Describe the bug

I want to use crane mutate to create an updated image, and, among other things, to change the entrypoint to [""].
However, this does not work.

Is there a trick to remove the entrypoint using crane/setting [""]?

To Reproduce

Create the mutated image

crane mutate \
  --platform linux/amd64 \
  --entrypoint="" \
  --tag your-new-image:new-tag \
  gcr.io/distroless/static-debian12:debug-nonroot

Inspect the config

crane config your-new-image:new-tag | jq .

... and the entrypoint is still there.

{
  "config": {
    "Entrypoint": [
      "/busybox/sh"
    ],
   "...": "..."
  },
  "...": "..."
}

Expected behavior

crane config your-new-image:new-tag | jq .

should show

{
  "config": {
    "Entrypoint": [
      ""
    ],
   "...": "..."
  },
  "...": "..."
}

Additional context

Add any other context about the problem here.

• Output of crane version: 0.20.1
• Registry used: GitLab container registry

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