The Nixpkgs repo is a Git repository. I forked the repository and I merge in updates using the normal git workflow. I've tried flakes and stuff, but none of them are as convenient as directly modifying files.
It require token payment for invitation codes, however the current implementation is frustrating. It generate a QR code for mobile wallet, but there's no way to pay from a browser wallet, which I suppose is more commonly used in web3.
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