build: dendritic flake, devShell and crate skeleton

flake.nix

@@ -0,0 +1,30 @@
+{
+  description = "valw, macOS-style screenshots for niri";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } (
+      { lib, ... }:
+      let
+        inherit (lib.filesystem) listFilesRecursive;
+        inherit (lib.lists) filter;
+        inherit (lib.strings) hasSuffix;
+      in
+      {
+        systems = [
+          "x86_64-linux"
+          "aarch64-linux"
+        ];
+        imports = filter (hasSuffix ".ulu.nix") (listFilesRecursive ./nix);
+      }
+    );
+}