feat: implement basic feature working for Linux only

__tests__/install.test.ts

@@ -0,0 +1,6 @@
+import {runCommand} from '../src/install'
+
+test('runCommand', async () => {
+  const result = await runCommand('echo foo bar')
+  expect(result).toBe('foo bar')
+})

__tests__/main.test.ts

@@ -1,27 +0,0 @@
-import {wait} from '../src/wait'
-import * as process from 'process'
-import * as cp from 'child_process'
-import * as path from 'path'
-
-test('throws invalid number', async () => {
-  const input = parseInt('foo', 10)
-  await expect(wait(input)).rejects.toThrow('milliseconds not a number')
-})
-
-test('wait 500 ms', async () => {
-  const start = new Date()
-  await wait(500)
-  const end = new Date()
-  var delta = Math.abs(end.getTime() - start.getTime())
-  expect(delta).toBeGreaterThan(450)
-})
-
-// shows how the runner will run a javascript action with env / stdout protocol
-test('test runs', () => {
-  process.env['INPUT_MILLISECONDS'] = '500'
-  const ip = path.join(__dirname, '..', 'lib', 'main.js')
-  const options: cp.ExecSyncOptions = {
-    env: process.env
-  }
-  console.log(cp.execSync(`node ${ip}`, options).toString())
-})