win support

git.js

@@ -0,0 +1,24 @@
+const exec = require('@actions/exec').exec
+const io = require('@actions/io')
+const os = require('os')
+const path = require('path')
+
+const folder = path.join(os.tmpdir(), `xmake${Date.now()}`)
+const opt = { cwd: folder }
+
+module.exports.folder = folder
+
+module.exports.create = async function (ref) {
+    await io.rmRF(folder)
+    await io.mkdirP(folder)
+    await exec('git', ['init'], opt)
+    await exec('git', ['remote', 'add', 'origin', 'https://github.com/xmake-io/xmake.git'], opt)
+    await exec('git', ['fetch'], opt)
+    await exec('git', ['checkout', ref], opt)
+    await exec('git', ['submodule', 'update', '--init', '--recursive'], opt)
+    return folder
+}
+
+module.exports.cleanup = async function () {
+    await io.rmRF(folder)
+}