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/channels/api4/main_test.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+import (
+	"flag"
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v6/server/channels/testlib"
+)
+
+var replicaFlag bool
+
+func TestMain(m *testing.M) {
+	if f := flag.Lookup("mysql-replica"); f == nil {
+		flag.BoolVar(&replicaFlag, "mysql-replica", false, "")
+		flag.Parse()
+	}
+
+	var options = testlib.HelperOptions{
+		EnableStore:     true,
+		EnableResources: true,
+		WithReadReplica: replicaFlag,
+	}
+
+	mainHelper = testlib.NewMainHelperWithOptions(&options)
+	defer mainHelper.Close()
+
+	mainHelper.Main(m)
+}