Fixed issues with building Sloth

- Made Sloth build with Rust stable again
- Made a rust-toolchain file so everyone uses the same version of Rust
- Fixed the GitHub Actions to have LLVM so it can actually build
- Fixed the Nix package to have LLVM so it can actually build

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index cd103f5..62c6d45 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 members = [ "sloth" ]
 
 [workspace.package]