Don't require Rust Nightly

[developedby]

Bend recently updated to not need rust nightly anymore.
Since hvm also doesn't need it to work and was only saying so that users only need one version of Rust to install both crates, we can now remove this requirement.

This means removing rust-toolchain.toml and removing mentions of rust nightly in the README.

We could also add the minimum supported rust version to Cargo.toml, which I tested to be 1.74.

[kings177]

reopening this, wouldn't it be better for the rust-toolchain.toml to have something like:

[toolchain]
profile = "minimal"
channel = "1.74.0"
components = ["rustfmt", "clippy"]

instead of completely deleting it?

[developedby]

reopening this, wouldn't it be better for the rust-toolchain.toml to have something like:

[toolchain]
profile = "minimal"
channel = "1.74.0"
components = ["rustfmt", "clippy"]

instead of completely deleting it?

We don't need to override the user's rust toolchain, just setting the minimum rust version in the cargo.toml should be enough

[kings177]

make sense

[steinerkelvin]

Reopening this. It's useful to have this file to enable reproducibles builds.

e.g. on https://github.com/fglab-tech/benda/blob/f9bf829a498c644bec6288bc652fc864d70b04d1/flake.nix#L20

[kings177]

i don't think that's necessary at all, you can just pass pkgs.rust-bin.stable.latest.default; to the flake.nix and that should work already, no?!

[kings177]

reclosing this.