New tool cache (#8)

* Consume new tool-cache

* Fix tests

* Fix workflow

Author: Danny McCormick

__tests__/installer.test.ts

@@ -7,8 +7,8 @@ import httpClient = require('typed-rest-client/HttpClient');
 const toolDir = path.join(__dirname, 'runner', 'tools');
 const tempDir = path.join(__dirname, 'runner', 'temp');
 
-process.env['RUNNER_TOOLSDIRECTORY'] = toolDir;
-process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
+process.env['RUNNER_TOOL_CACHE'] = toolDir;
+process.env['RUNNER_TEMP'] = tempDir;
 import * as installer from '../src/installer';
 
 const IS_WINDOWS = process.platform === 'win32';