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

server/cmd/mattermost/commands/root.go

@@ -0,0 +1,25 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package commands
+
+import (
+	"github.com/spf13/cobra"
+)
+
+type Command = cobra.Command
+
+func Run(args []string) error {
+	RootCmd.SetArgs(args)
+	return RootCmd.Execute()
+}
+
+var RootCmd = &cobra.Command{
+	Use:   "mattermost",
+	Short: "Open source, self-hosted Slack-alternative",
+	Long:  `Mattermost offers workplace messaging across web, PC and phones with archiving, search and integration with your existing systems. Documentation available at https://docs.mattermost.com`,
+}
+
+func init() {
+	RootCmd.PersistentFlags().StringP("config", "c", "", "Configuration file to use.")
+}