Previously, the original publisher of a package in GitHub Packages had the owner attribute, which granted them admin privileges for the package. The current package admin role has the exact same privileges.
As of today the two roles with identical privileges are being merged and the admin role can be used as the ultimate authority. By default, both the original publisher and the organization owner will have admin privileges on that package.
In addition to uploading and downloading a package, admins can manage a package, read and write package metadata and grant package permissions.
As part of this change, the owner badge is no longer shown next to the package publisher's username.