Various build and developer fixes, some optimizations (#2975)

* Various build and developer fixes, some optimizations

* Fix the linux build

* Fix afterpack

* Fix notarization variables

* Revert macos-notification-state changes from this PR

* Only build the tar for PRs

* Also ci

* Fix copy script

* Fix copy script more

* Remove @babel/cli

* Fix windows build

* Fix MAS build

scripts/watch.js

@@ -0,0 +1,26 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+const electron = require('electron-connect').server.create({path: 'dist/'});
+const webpack = require('webpack');
+
+const mainConfig = require('../webpack.config.main.js');
+const preloadConfig = require('../webpack.config.preload.js');
+const rendererConfig = require('../webpack.config.renderer.js');
+
+Promise.all([mainConfig, preloadConfig, rendererConfig].map((config) => {
+    return new Promise((resolve) => {
+        const compiler = webpack(config);
+        compiler.watch({}, (err, stats) => {
+            if (err) {
+                console.error(err);
+            }
+            process.stdout.write(stats.toString({colors: true}));
+            process.stdout.write('\n');
+            if (!stats.hasErrors()) {
+                electron.restart();
+            }
+            resolve();
+        });
+    });
+})).then(() => electron.start());