add my crappy nix shell file for testing

.envrc

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+use nix

shell.nix

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+{ pkgs ? import <nixpkgs> { }
+, android ? fetchTarball "https://github.com/tadfisher/android-nixpkgs/archive/refs/tags/2024-04-02.tar.gz"
+, use_android ? false
+, android_emulator ? false
+}:
+with pkgs;
+
+let
+  x11libs = lib.makeLibraryPath [ xorg.libX11 xorg.libXcursor xorg.libXrandr xorg.libXi libglvnd vulkan-loader vulkan-validation-layers libxkbcommon ];
+  android-nixpkgs = callPackage android { };
+  ndk-version = "24.0.8215888";
+
+  android-sdk = android-nixpkgs.sdk (sdkPkgs: with sdkPkgs; [
+    cmdline-tools-latest
+    build-tools-34-0-0
+    platform-tools
+    platforms-android-30
+    ndk-24-0-8215888
+  ] ++ lib.optionals android_emulator [emulator]);
+
+  android-sdk-path = "${android-sdk.out}/share/android-sdk";
+  android-ndk-path = "${android-sdk-path}/ndk/${ndk-version}";
+
+in
+mkShell ({
+  buildInputs = [] ++ lib.optional use_android [
+    android-sdk
+  ];
+  nativeBuildInputs = [
+    #cargo-udeps
+    #cargo-edit
+    #cargo-watch
+    rustup
+    rustfmt
+    trunk
+    libiconv
+    pkg-config
+    #cmake
+    fontconfig
+    openssl
+    #brotli
+    #wabt
+    #gdb
+    #heaptrack
+  ] ++ lib.optional use_android [
+    jre
+    openssl
+    libiconv
+    cargo-apk
+  ] ++ lib.optional stdenv.isDarwin [
+    darwin.apple_sdk.frameworks.Security
+    darwin.apple_sdk.frameworks.OpenGL
+    darwin.apple_sdk.frameworks.CoreServices
+    darwin.apple_sdk.frameworks.AppKit
+  ];
+
+} // (if !stdenv.isDarwin then {
+  LD_LIBRARY_PATH="${x11libs}";
+} else {}) // (if use_android then {
+  ANDROID_NDK_ROOT = android-ndk-path;
+} else {}))