Update to use the GIthub TOKEN instead of PAT

[pdonorio]

Hello there, thanks for this!

Currently this action requires the Personal Access Token, as stated in the README:
https://github.com/bots-house/ghcr-delete-image-action/blame/main/README.md#L33

What would be better, if possible, is to use instead to the GITHUB_TOKEN secret (link), as the recommended way since it's already created for you and scoped.

In fact:

If your workflow is using a personal access token (PAT) to authenticate to ghcr.io, then we highly recommend you update your workflow to use the GITHUB_TOKEN.

found in https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#authenticating-to-the-container-registry

I already use this action for login to the registry which may give you inspiration since it's using the GITHUB_TOKEN.

Let me know if I can help!

[pdonorio]

So I have been spending the whole morning looking for the problem.

It seems the issue is with the GITHUB_TOKEN permissions which don't reach DELETION on packages at Organization level like containers are in Github, e.g. see this thread.

Closing as this currently can't be implemented.