Add linter and a little bit more tests

Signed-off-by: Nikolai Rodionov <iam@allanger.xyz>

cmd/migrate.go

@@ -39,7 +39,8 @@ func (cmd *Migrate) Run(ctx context.Context) error {
 	log.Info("Preparing database migrations")
 	m, err := migrate.NewWithDatabaseInstance(
 		cmd.MigrationsPath,
-		"postgres", driver)
+		"postgres", driver,
+	)
 	if err != nil {
 		log.Error(err, "Couldn't perform database migrations")
 		return err