fix(cache): default init using tmpdir

bin/config-validator.js

@@ -8,10 +8,6 @@ const { getConfig } = require('../dist/config/file');
 const cache = require('../dist/workers/global/cache');
 const { configFileNames } = require('../dist/config/app-strings');
 
-// istanbul ignore if
-if (!global.renovateCache) {
-  cache.init(os.tmpdir());
-}
 /* eslint-disable no-console */
 
 let returnVal = 0;

lib/workers/global/cache.ts

+import os from 'os';
 import * as cacache from 'cacache';
 import path from 'path';
 import { DateTime } from 'luxon';
@@ -58,3 +59,5 @@ export function init(cacheDir: string): void {
   logger.debug('Initializing Renovate internal cache into ' + renovateCache);
   global.renovateCache = global.renovateCache || { get, set, rm, rmAll };
 }
+
+init(os.tmpdir()); // Use default temporary dir to begin with

lib/workers/global/index.ts

@@ -57,7 +57,6 @@ export async function getRepositoryConfig(
 
 export async function start(): Promise<0 | 1> {
   try {
-    cache.init(os.tmpdir());
     let config = await configParser.parseConfigs(process.env, process.argv);
     config = await initPlatform(config);
     config = await setDirectories(config);