ci: move to ghcr.io and use GITHUB_TOKEN for registry auth #151
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Authenticating to ghcr.io according to https://docs.github.com/en/packages/managing-github-packages-using-github-actions-workflows/publishing-and-installing-a-package-with-github-actions#upgrading-a-workflow-that-accesses-a-registry-using-a-personal-access-token.
This should fix our release action.