feat: nix flake

flake.nix

@@ -0,0 +1,39 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    crane = {
+      inputs.nixpkgs.follows = "nixpkgs";
+      url = "github:ipetkov/crane";
+    };
+  };
+
+
+  outputs = { self, nixpkgs, crane }:
+  let supportedSystems = [ "aarch64-linux" "x86_64-linux" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+  in {
+    packages = forAllSystems (system: let pkgs = nixpkgsFor.${system}; in {
+      default = crane.lib.${system}.buildPackage {
+        pname = "protostar";
+        version = "0.1.0";
+        src = ./.;
+        
+        cargoTestCommand = "echo \"looks good to me\"";
+        
+        STARDUST_RES_PREFIXES = pkgs.stdenvNoCC.mkDerivation {
+          name = "resources";
+          src = ./.;
+  
+          buildPhase = "cp -r $src/res $out";
+        };
+        
+        # for tests
+        nativeBuildInputs = with pkgs; [
+          ashpd-demo
+        ];
+        XDG_CACHE_HOME = "/tmp";
+      };
+    });
+  };
+}