Prepare WebGIS project for Docker deployment

webgis02/config.php

@@ -1,15 +1,38 @@
 <?php
-$host = getenv('DB_HOST') ?: '127.0.0.1';
-$user = getenv('DB_USER') ?: 'root';
-$pass = getenv('DB_PASSWORD') !== false ? getenv('DB_PASSWORD') : '';
-$db   = getenv('DB_NAME') ?: 'webgis_db';
+mysqli_report(MYSQLI_REPORT_OFF);
 
-$conn = mysqli_connect($host, $user, $pass, $db);
+function env_first(array $keys, $default = '') {
+    foreach ($keys as $key) {
+        $value = getenv($key);
+        if ($value !== false && $value !== '') return $value;
+    }
+    return $default;
+}
+
+$hosts = array_filter(array_unique([
+    env_first(['DB_HOST', 'MYSQL_HOST', 'MARIADB_HOST']),
+    'mysql',
+    'mariadb',
+    'db',
+    'database',
+    'host.docker.internal',
+    '127.0.0.1',
+]));
+
+$user = env_first(['DB_USER', 'MYSQL_USER', 'MARIADB_USER'], 'root');
+$pass = env_first(['DB_PASSWORD', 'MYSQL_PASSWORD', 'MARIADB_PASSWORD'], '');
+$db   = env_first(['WEBGIS02_DB_NAME', 'DB_NAME_WEBGIS02', 'DB_NAME', 'MYSQL_DATABASE', 'MARIADB_DATABASE'], 'webgis_db');
+
+$conn = false;
+foreach ($hosts as $host) {
+    $conn = mysqli_connect($host, $user, $pass, $db);
+    if ($conn) break;
+}
 
 if (!$conn) {
     die(json_encode([
         'status'  => 'error',
-        'message' => 'Koneksi database gagal: ' . mysqli_connect_error()
+        'message' => "Koneksi database gagal. Pastikan MySQL service berjalan, environment DB_HOST/DB_USER/DB_PASSWORD benar, dan database '$db' sudah diimport. Error: " . mysqli_connect_error()
     ]));
 }