I don't think we have to upload and download the charm as an artifact every time. We had to do it for rocks because the command to upload the resource only accepts the image already on ghcr (If I remember correctly?)

Honestly we might not even need to upload the rock too. I forget

I'm not an expert in GitHub Actions, but I thought that whatever you do in a job (i.e. pack-charm) is not available for future jobs. So you either re-run the charming command or download the output from somewhere.

https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/storing-and-sharing-data-from-a-workflow#passing-data-between-jobs-in-a-workflow