nix: package with flakes; simplify devshell

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ia37044debea91a1db3d944a0c74f66356a6a6964

nix/shell.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  mkShell,
+  cargo,
+  rustfmt,
+  clippy,
+  taplo,
+  pkg-config,
+  wayland,
+  libxkbcommon,
+}: let
+  runtimeDeps = [
+    libxkbcommon
+    wayland
+  ];
+in
+  mkShell {
+    name = "rust";
+
+    strictDeps = true;
+    nativeBuildInputs = [
+      pkg-config
+
+      cargo
+      clippy
+      (rustfmt.override {asNightly = true;})
+      taplo
+    ];
+
+    buildInputs = runtimeDeps;
+
+    env.LD_LIBRARY_PATH = "$LD_LIBRARY_PATH:${lib.makeLibraryPath runtimeDeps}";
+  }