authentication error using `wasm-pkg-loader`

I just downloaded `wasm-pkg-loader` for the first time, and tried the example from the README:

```bash
wasm-pkg-loader wasi:preview1-command-adapter
```

For some reason this doesn't seem to work, and I'm met with an authentication error:

```bash
Error: error listing wasi:preview1-command-adapter releases

Caused by:
0: OCI error: Authentication failure: {"errors":[{"code":"DENIED","message":"requested access to the resource is denied"}]}

1: Authentication failure: {"errors":[{"code":"DENIED","message":"requested access to the resource is denied"}]}
```

I'm not sure what is causing this failure, but I assume the intent was for this to succeed? Is there something users should be configuring or installing before executing this command so it works?