Magic Nix Cache has been deprecated due to a change in the underlying GitHub APIs and will stop working on 1 February 2025. To continue caching Nix builds in GitHub Actions, use FlakeHub Cache instead. Replace... uses: DeterminateSystems/magic-nix-cache-action@v9 ...with... uses: DeterminateSystems/flakehub-cache-action@v9 For more details: https://dtr.mn/magic-nix-cache-eol