build: add rust-toolchain.toml

arxanas · arxanas · commit cce1350a924c · 2024-07-07T11:41:38.000-07:00
It seems easier for contributors to get started if the compiler version is already configured; plus, this will presumably make it so that I don't have to set the Rust version with `rustup override` whenever I create a new worktree.
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+# Current minimum-supported Rust version
+channel = "1.74"
+profile = "default"
