Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

webapp/scripts/run.js

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+/* eslint-disable no-console, no-process-env */
+
+const chalk = require('chalk');
+const concurrently = require('concurrently');
+
+const {makeRunner} = require('./runner.js');
+const {getPlatformCommands} = require('./utils.js');
+
+async function watchAll(useRunner) {
+    if (!useRunner) {
+        console.log(chalk.inverse.bold('Watching web app and all subpackages...'));
+    }
+
+    const commands = [
+        {command: 'npm:run --workspace=channels', name: 'webapp', prefixColor: 'cyan'},
+        {command: 'npm:start:product --workspace=boards', name: 'boards', prefixColor: 'blue'},
+        {command: 'npm:start:product --workspace=playbooks', name: 'playbooks', prefixColor: 'red'},
+    ];
+
+    commands.push(...getPlatformCommands('run'));
+
+    let runner;
+    if (useRunner) {
+        runner = makeRunner(commands);
+    }
+
+    console.log('\n');
+
+    const {result, commands: runningCommands} = concurrently(
+        commands,
+        {
+            killOthers: 'failure',
+            outputStream: runner?.getOutputStream(),
+        },
+    );
+
+    runner?.addCloseListener(() => {
+        for (const command of runningCommands) {
+            command.kill('SIGINT');
+        }
+    });
+
+    await result;
+}
+
+const useRunner = process.argv[2] === '--runner' || process.env.MM_USE_WEBAPP_RUNNER;
+
+watchAll(useRunner);