added api server and changed docker files

login-auth_backend/node_modules/mysql2/lib/promise/pool_connection.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const PromiseConnection = require('./connection.js');
+const BasePoolConnection = require('../base/pool_connection.js');
+
+class PromisePoolConnection extends PromiseConnection {
+  constructor(connection, promiseImpl) {
+    super(connection, promiseImpl);
+  }
+
+  destroy() {
+    return BasePoolConnection.prototype.destroy.apply(
+      this.connection,
+      arguments
+    );
+  }
+}
+
+module.exports = PromisePoolConnection;