Add rust devshell

Add sccache

Add clang so rust can actually build

devshells/rust.nix

@@ -0,0 +1,29 @@
+{ withSystem, inputs, ... }:
+{
+  perSystem =
+    { config, pkgs, ... }:
+    {
+      devshells.rust = {
+        env = [
+          {
+            name = "RUSTC_WRAPPER";
+            value = "${pkgs.sccache}/bin/sccache";
+          }
+        ];
+        commands = [
+          # {
+          #   help = "print hello";
+          #   name = "hello";
+          #   command = "echo hello";
+          # }
+        ];
+        packages = with pkgs; [
+          # Rust toolchain
+          clang
+          rustup
+          # Faster builds
+          sccache
+        ];
+      };
+    };
+}