refactor: enhance config handling in main; unify config parsing logic across scripts

cmd/go_migrate/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"flag"
 	"sync"
 	"time"
 
@@ -19,7 +20,18 @@ import (
 func main() {
 	configureLog()
 
-	migrationConfig, err := config.ReadMigrationConfig()
+	configPath := flag.String("config", "", "path to migration config file")
+	flag.Parse()
+
+	if flag.NArg() > 1 {
+		log.Fatalf("only one config file path is allowed")
+	}
+
+	if *configPath == "" && flag.NArg() == 1 {
+		*configPath = flag.Arg(0)
+	}
+
+	migrationConfig, err := config.ReadMigrationConfig(*configPath)
 	if err != nil {
 		log.Fatalf("error leyendo configuracion: %v", err)
 	}