Add Docker entrypont, update docs

pkg/scripts.go

@@ -24,7 +24,7 @@ func CreateCrontabScript(disableCompression bool, storage string) {
 
 	scriptContent := fmt.Sprintf(`#!/usr/bin/env bash
 set -e
-bkup backup --dbname %s --port %s --storage %s %v
+/usr/local/bin/mysql-bkup backup --dbname %s --port %s --storage %s %v
 `, os.Getenv("DB_NAME"), os.Getenv("DB_PORT"), storage, disableC)
 
 	if err := utils.WriteToFile(backupCronFile, scriptContent); err != nil {