Respect ignore migration when add column (#4276)

continue https://github.com/go-gorm/gorm/pull/4028

migrator/migrator.go

@@ -295,11 +295,14 @@ func (m Migrator) RenameTable(oldName, newName interface{}) error {
 func (m Migrator) AddColumn(value interface{}, field string) error {
 	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
 		if field := stmt.Schema.LookUpField(field); field != nil {
+			if !field.IgnoreMigration {
 				return m.DB.Exec(
 					"ALTER TABLE ? ADD ? ?",
 					m.CurrentTable(stmt), clause.Column{Name: field.DBName}, m.DB.Migrator().FullDataTypeOf(field),
 				).Error
 			}
+			return nil
+		}
 		return fmt.Errorf("failed to look up field with name: %s", field)
 	})
 }