Get number of downloads of ghcr.io packages

[nvuillam]

Should work from build.py using https://docs.github.com/fr/graphql/reference/objects#packagestatistics

[github-actions]

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
It will be closed in 14 days if no further activity occurs.
Thank you for your contributions.

If you think this issue should stay open, please remove the O: stale 🤖 label or comment on the issue.