Add Windows to GitHub Actions CI matrix

Summary: Pull Request resolved: https://github.com/facebook/flipper/pull/741

Reviewed By: jknoxville

Differential Revision: D19371114

fbshipit-source-id: 07c6bd71e58011cc3fffa34354546eb773e3fc3d

src/utils/__tests__/jsonFileStorage.node.js

@@ -13,6 +13,7 @@ import fs from 'fs';
 const validSerializedData = fs
   .readFileSync('src/utils/__tests__/data/settings-v1-valid.json')
   .toString()
+  .replace(/\r\n/g, '\n')
   .trim();
 
 const validDeserializedData =