nix: devShell: add packages for proxy development

devShells/default.nix

@@ -1,17 +1,45 @@
-{ mkShell, lib, systemd, cargo, rust-analyzer, rustfmt, passt, bubblewrap, libkrun, muvm, sidebus-broker }:
+{
+  mkShell,
+  lib,
+  systemd,
+  cargo,
+  rust-analyzer,
+  rustfmt,
+  passt,
+  bubblewrap,
+  libkrun,
+  muvm,
+  sidebus-broker,
+  pkgs,
+}:
 
 let
-  projects = [ libkrun muvm ];
-in mkShell {
+  projects = [
+    libkrun
+    muvm
+  ];
+in
+mkShell {
   MUVM_UDEVD_PATH = "${systemd}/lib/systemd/systemd-udevd";
   nativeBuildInputs = lib.concatMap (pkg: pkg.nativeBuildInputs) projects;
-  buildInputs = (lib.concatMap (pkg: pkg.buildInputs) projects) ++ [
-    # virglrenderer
-    cargo
-    rust-analyzer
-    rustfmt
-    passt
-    bubblewrap
-    sidebus-broker
-  ];
+  buildInputs =
+    (lib.concatMap (pkg: pkg.buildInputs) projects)
+    ++ [
+      # virglrenderer
+      cargo
+      rust-analyzer
+      rustfmt
+      passt
+      bubblewrap
+      sidebus-broker
+    ]
+    ++ (with pkgs; [
+      meson
+      wayland
+      wayland-protocols
+      wayland-scanner
+      cairo
+      libgbm
+    ]);
+  # Enough things to compile wl-cross-domain-proxy, muvm, etc. in development
 }