fix cache file path for containers

Author: Lifeismana

src/cache.mjs

@@ -3,7 +3,7 @@ import { readFile, writeFile } from "node:fs/promises";
 
 const isDocker = existsSync("/.dockerenv");
 const isPodman = existsSync("/run/.containerenv");
-const CACHE_FILE = isDocker || isPodman ? "/var/cache/steam-update-dispatcher" : "config/cache.json";
+const CACHE_FILE = isDocker || isPodman ? "/var/cache/steam-update-dispatcher/cache.json" : "config/cache.json";
 
 export default class Cache {
 	constructor() {