install: nix examples (draft)

install/nix/default.nix

@@ -0,0 +1,24 @@
+{ pkgs ? import <nixpkgs> { system = "x86_64-linux"; } }:
+
+let
+  mongo = pkgs.callPackage ./mongo.nix {};
+in pkgs.dockerTools.buildImage {
+  name = "hydrooj/web-base";
+  tag = "latest";
+
+  contents = [
+    mongo
+    pkgs.minio
+    pkgs.nodejs
+    pkgs.yarn
+  ];
+
+  config = {
+    WorkingDir = "/data";
+    Volumes = { "/data" = { }; };
+    ExposedPorts = {
+      "8888" = { };
+    };
+    Cmd = [ "hydrooj" ];
+  };
+}