Put nix package derivations in separate file and join symlinks

nix/package.nix

@@ -0,0 +1,50 @@
+{
+  lib,
+  stdenv,
+  buildNpmPackage,
+  symlinkJoin,
+}:
+
+let
+  pname = "archtika";
+  version = "1.0.0";
+
+  web = buildNpmPackage {
+    inherit pname version;
+    name = "archtika-web-app";
+    src = ../web-app;
+    npmDepsHash = "sha256-DmIII/x5ANlEpKtnZC/JlbVAvhbgnSiNn8hkj+qVCZY=";
+    npmFlags = [ "--legacy-peer-deps" ];
+    installPhase = ''
+      mkdir -p $out/web-app
+      cp package.json $out/web-app
+      cp -r node_modules $out/web-app
+      cp -r build/* $out/web-app
+    '';
+  };
+
+  api = stdenv.mkDerivation {
+    inherit pname version;
+    name = "archtika-api";
+    src = ../rest-api;
+    installPhase = ''
+      mkdir -p $out/rest-api/db/migrations
+      cp -r db/migrations/* $out/rest-api/db/migrations
+    '';
+  };
+in
+symlinkJoin {
+  name = pname;
+  paths = [
+    web
+    api
+  ];
+
+  meta = with lib; {
+    description = "A modern, performant and lightweight CMS";
+    homepage = "https://archtika.com";
+    license = licenses.mit;
+    maintainers = with maintainers; [ thiloho ];
+    platforms = platforms.unix;
+  };
+}