Add Cargo.lock to repository (remove from gitignore)

[joachimschmidt557]

According to the Cargo Book, executables should include the Cargo.lock file in their git repositories to enable reproducible builds and make packaging easier.

[jedisct1]

In practice, this is unfortunately a massive pain when PRs (or anything to be merged) are not based on the very latest Cargo.toml version, with an up to date Cargo.lock generated by a compatible Rust version.

As a contributor to some Rust projects, I really hate that every time.

But well... given that there isn't a lot of external contributions to that project, it may be fine...

[jedisct1]

Reproducible builds is not something Rust supports yet: rust-lang/rust#34902 https://github.com/rust-lang/rust/labels/A-reproducibility

[joachimschmidt557]

Thanks! I should add: the reason for this "proposal" was that I'm trying to package this project for Nixpkgs, which requires the presence of a Cargo.lock file to make it "reproducible" enough for Nixpkgs.

If the Cargo.lock file is too much of a burden in the future, it can be patched in by the Nixpkgs build script.