If you already pulled api then you have pulled worker by proxy. It's still up here - https://github.com/fluxerapp/fluxer/pkgs/container/fluxer-api
Maybe you made a typo when manually modifying it? ex. gchr.io insted of ghcr.io? Unless you're actually trying to build it from source but even then should still work as it's apart of api package.
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Comment by @MrRubberDucky
fluxer-apiwith different environment variables, specificallydocker-compose.yamlapipackage.