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/build/docker-compose-generator/main.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"gopkg.in/yaml.v2"
+)
+
+type DockerCompose struct {
+	Version  string                `yaml:"version"`
+	Services map[string]*Container `yaml:"services"`
+}
+
+type Container struct {
+	Command   string   `yaml:"command,omitempty"`
+	Image     string   `yaml:"image,omitempty"`
+	Network   []string `yaml:"networks,omitempty"`
+	DependsOn []string `yaml:"depends_on,omitempty"`
+}
+
+func main() {
+	validServices := map[string]int{
+		"mysql":              3306,
+		"postgres":           5432,
+		"minio":              9000,
+		"inbucket":           9001,
+		"openldap":           389,
+		"elasticsearch":      9200,
+		"dejavu":             1358,
+		"keycloak":           8080,
+		"prometheus":         9090,
+		"grafana":            3000,
+		"mysql-read-replica": 3306, // FIXME: not recognizing the successfully running service on port 3307.
+	}
+	command := []string{}
+	for _, arg := range os.Args[1:] {
+		port, ok := validServices[arg]
+		if !ok {
+			panic(fmt.Sprintf("Unknown service %s", arg))
+		}
+		command = append(command, fmt.Sprintf("%s:%d", arg, port))
+	}
+
+	var dockerCompose DockerCompose
+	dockerCompose.Version = "2.4"
+	dockerCompose.Services = map[string]*Container{}
+	dockerCompose.Services["start_dependencies"] = &Container{
+		Image:     "mattermost/mattermost-wait-for-dep:latest",
+		Network:   []string{"mm-test"},
+		DependsOn: os.Args[1:],
+		Command:   strings.Join(command, " "),
+	}
+	resultData, err := yaml.Marshal(dockerCompose)
+	if err != nil {
+		panic(fmt.Sprintf("Unable to serialize the docker-compose file: %s.", err.Error()))
+	}
+	fmt.Println(string(resultData))
+}