Add dockerfile and update config file

SIG_miskin/gis/config.php

@@ -1,14 +1,12 @@
 <?php
-// config.php - Konfigurasi Database
-define('DB_HOST', 'localhost');
-define('DB_USER', 'root');
-define('DB_PASS', '');
-define('DB_NAME', 'gis_penduduk_miskin');
+define('DB_HOST', getenv('DB_HOST'));
+define('DB_USER', getenv('DB_USER'));
+define('DB_PASS', getenv('DB_PASS'));
+define('DB_NAME', getenv('DB_NAME'));
 
 $conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 $conn->set_charset('utf8mb4');
-
 if ($conn->connect_error) {
-    http_response_code(500);
-    die(json_encode(['error' => 'Database connection failed: ' . $conn->connect_error]));
-}
+    die("Koneksi gagal: " . $conn->connect_error);
+}
+?>