WASIX cargo registry

Serves WASIX forks of public crates; everything else is
redirected to crates.io. Use it via source replacement in
.cargo/config.toml:

[source.crates-io]
replace-with = "wasix"

[source.wasix]
registry = "sparse+https://cargo-registry.wasix.org/"

Publishing goes through the forks-only index instead:

CARGO_REGISTRIES_WASIX_INDEX="sparse+https://cargo-registry.wasix.org/publish/"

https://github.com/wasix-org/cargo-registry