feat(cache.mjs): make cache stdTTL configurable

.env.sample

@@ -19,3 +19,6 @@ HTTPS_CERT_PATH="/some/where.crt"
 ENABLED_CORS="no" # cors ('yes' or 'no'), CORS_ORIGIN is required
 ENABLED_CORS_ORIGIN_CHECK="no" # is the API public to every client ('yes' or 'no')
 CORS_ORIGIN="https://example.org"
+
+# settings
+CACHE_MAX_AGE="86400" # cache max age in seconds

src/init/cache.mjs

@@ -1,10 +1,12 @@
 // node-cache is an in-memory cache.
 
 // Import modules
+import {getMust} from "../config.mjs";
 import NodeCache from "node-cache";
 
 // Initialize node-cache
-const cache = new NodeCache({stdTTL: 7200});
+const stdTTL = getMust("CACHE_MAX_TTL");
+const cache = new NodeCache({stdTTL: parseInt(stdTTL)});
 
 // Export as a function named useCache
 export const useCache = () => cache;