chore: Remove unused migrationDir function and related imports

Support Migration using sql ( for future use)

internal/database/migration.go

@@ -4,8 +4,6 @@ import (
 	"embed"
 	"fmt"
 	"os"
-	"path/filepath"
-	"runtime"
 
 	"donetick.com/core/config"
 	chModel "donetick.com/core/internal/chore/model"
@@ -67,11 +65,3 @@ func MigrationScripts(gormDB *gorm.DB, cfg *config.Config) error {
 	fmt.Printf("Applied %d migrations!\n", n)
 	return nil
 }
-
-func migrationDir() string {
-	_, filename, _, ok := runtime.Caller(1)
-	if !ok {
-		return ""
-	}
-	return filepath.Join(filepath.Dir(filename), "../../migrations")
-}

internal/database/migrations/20241123_initial_sql_script.sql

@@ -0,0 +1,2 @@
+-- +migrate Up
+-- nothing here just to include in he embeded sql :)