feat: add Nix and NixOS assets

Author: tomeon

.gitignore

@@ -1,3 +1,14 @@
 node_modules
 db/*
 *.log
+
+# VM disk images
+*.qcow2
+
+# Nix build results
+result
+result-*
+repl-result-*
+
+# NixOS test driver REPL history
+.nixos-test-history

app.nix

@@ -0,0 +1,36 @@
+{
+  lib,
+  config,
+  dream2nix,
+  pkgs,
+  ...
+} @ args: let
+  packageJSON = lib.importJSON ./package.json;
+in {
+  imports = [
+    dream2nix.modules.dream2nix.nodejs-package-json-v3
+    dream2nix.modules.dream2nix.nodejs-granular-v3
+  ];
+
+  inherit (packageJSON) name version;
+
+  # Take advantage of a shell injection vector in dream2nix in order to apply a
+  # workaround for an issue with `npm i` converting dependencies specified with
+  # `git+https://` or `github:` to `git+ssh://`.
+  # See:
+  #   - https://github.com/npm/cli/issues/2610
+  #   - https://github.com/npm/cli/issues/2631
+  nodejs-package-json.npmArgs = lib.mkAfter [
+    "--package-lock-only' ; ${lib.getExe pkgs.gnused} -i -e 's|git+ssh://|git+https://|g' ./package-lock.json #"
+  ];
+
+  mkDerivation = {
+    src = lib.cleanSource ./.;
+    doCheck = false;
+    meta = {
+      # XXX broken somehow? `lib.licenses.gpl3` works...
+      #license = lib.licenses.cc-by-nc-40;
+      homepage = "https://github.com/LowPowerLab/RaspberryPi-Gateway";
+    };
+  };
+}