add basic deno flake

package.nix

@@ -0,0 +1,40 @@
+{ pkgs, target, name }:
+pkgs.stdenv.mkDerivation rec {
+  pname = name;
+  version = "0.1.0";
+  src = ./.;
+
+  __noChroot = true;
+  
+  dontStrip = true;
+
+  denort = pkgs.fetchurl {
+    url = "https://dl.deno.land/release/v${pkgs.deno.version}/denort-${target}.zip";
+    hash = "sha256-J2LfvHPbJvcOpbQOd6EmGxHDciez7tG10etK4bqQhLI=";
+  };
+
+  nativeBuildInputs = with pkgs; [ deno unzip ];
+
+  configurePhase = ''
+    export DENO_DIR=./.deno_cache;
+    mkdir -p $TMPDIR/denort
+    pushd $TMPDIR/denort
+    unzip ${denort}
+    chmod +x denort
+    popd
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+
+    export DENORT_BIN="$TMPDIR/denort/denort"
+
+    deno compile --output app main.ts --target=${target}
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp app $out/bin/${name}
+  '';
+}