Add command for migrating database (#4954)

main.go

@@ -47,6 +47,7 @@ arguments - which can alternatively be run by running the subcommand web.`
 		cmd.CmdCert,
 		cmd.CmdAdmin,
 		cmd.CmdGenerate,
+		cmd.CmdMigrate,
 	}
 	app.Flags = append(app.Flags, []cli.Flag{}...)
 	app.Action = cmd.CmdWeb.Action