Unable to pull an image without a token

```
$ docker run --rm ghcr.io/salsadigitalauorg/shipshape:latest shipshape --version
Unable to find image 'ghcr.io/salsadigitalauorg/shipshape:latest' locally
docker: Error response from daemon: Head "https://ghcr.io/v2/salsadigitalauorg/shipshape/manifests/latest": denied: denied

```

Could someone please check that pulling without a token is permitted