feat(docker): add non-root user, labels, and healthcheck (closes #433)

Now works with Pterodactyl.

src/routes/status.js

@@ -0,0 +1,6 @@
+module.exports.get = () => ({
+	handler: async (req, res) => {
+		const { status } = res.context.config.client.ws;
+		res.code(status === 0 ? 200 : 425).send(status);
+	},
+});