Add MariaDB container; add PDO connection; add error middleware

src/Settings.php

@@ -5,12 +5,27 @@ namespace MailAccountAdmin;
 
 class Settings
 {
+    public function isDebugMode(): bool
+    {
+        return getenv('APP_DEBUG') === 'true';
+    }
+
     public function getTwigSettings(): array
     {
-        $cacheDir = getenv('TWIG_CACHE_DIR');
-
         return [
-            'cache' => !empty($cacheDir) ? $cacheDir : false,
+            'cache' => getenv('TWIG_CACHE_DIR') ?: false,
+            'strict_variables' => getenv('TWIG_STRICT') === 'true',
+        ];
+    }
+
+    public function getDatabaseSettings(): array
+    {
+        return [
+            'host' => getenv('DB_HOST') ?: 'localhost',
+            'port' => getenv('DB_PORT') ?: 3306,
+            'dbname' => getenv('DB_DATABASE') ?: '',
+            'username' => getenv('DB_USERNAME') ?: '',
+            'password' => getenv('DB_PASSWORD') ?: '',
         ];
     }
 }