add: stalwart package, nixos module

ripped from nixpkgs, maintaining stalwart myself for a bit

pkgs/common/stalwart/webui.nix

@@ -0,0 +1,76 @@
+{
+  lib,
+  buildNpmPackage,
+  zip,
+  stalwart_0_16,
+  fetchFromGitHub,
+  nix-update-script,
+}:
+buildNpmPackage (finalAttrs: {
+  pname = "webui";
+  version = "1.0.11";
+
+  src = fetchFromGitHub {
+    owner = "stalwartlabs";
+    repo = "webui";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-luaNHpPg7XHnPfQqhLEq+wW1/crXLogzyyltFr4mdBk=";
+  };
+
+  npmDepsHash = "sha256-qe9cSrvs6kWwgbOO0xL7MBaJvICOvyuLFVi9R0dgnXQ=";
+  __structuredAttrs = true;
+
+  env = {
+    # https://github.com/stalwartlabs/webui/tree/main#environment-variables
+    # https://github.com/stalwartlabs/webui/blob/main/.env.development
+    VITE_API_BASE_URL = "";
+    VITE_OAUTH_CLIENT_ID = "stalwart-webui";
+  };
+
+  nativeBuildInputs = [ zip ];
+  preBuild = ''
+    rm .env.development
+  '';
+
+  doCheck = true;
+  checkPhase = ''
+    runHook preCheck
+    npm run test
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out
+    cd dist
+    zip -r $out/webui.zip *
+    cd ..
+    runHook postInstall
+  '';
+
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
+  meta = {
+    description = "Stalwart WebUI";
+    longDescription = ''
+      Stalwart WebUI is schema-driven single-page application for administering Stalwart.
+
+      After authentication the panel fetches a JSON schema from the server and dynamically
+      generates all forms, lists, navigation, and layouts from that schema. Nothing is hardcoded.
+    '';
+    homepage = "https://github.com/stalwartlabs/webui";
+    changelog = "https://github.com/stalwartlabs/webui/blob/${finalAttrs.src.tag}/CHANGELOG.md";
+    license = lib.licenses.OR [
+      lib.licenses.agpl3Only
+      {
+        fullName = "Stalwart Enterprise License 2.0 (SELv2) Agreement";
+        url = "https://github.com/stalwartlabs/webui/blob/main/LICENSES/LicenseRef-SEL.txt";
+        free = false;
+        redistributable = false;
+      }
+    ];
+    inherit (stalwart_0_16.meta) maintainers;
+  };
+})