switch from jest to vitest

vitest.setup.ts

@@ -0,0 +1,11 @@
+import * as fs from 'node:fs';
+import * as os from 'node:os';
+import * as path from 'node:path';
+
+const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'ghaction-upx-'));
+
+process.env = Object.assign({}, process.env, {
+  TEMP: tmpDir,
+  RUNNER_TEMP: path.join(tmpDir, 'runner-temp'),
+  RUNNER_TOOL_CACHE: path.join(tmpDir, 'runner-tool-cache')
+});