feat: Add postgres container

tests/Integration/ContainerTest.php

@@ -9,6 +9,7 @@ use Redis;
 use Testcontainer\Container\MariaDBContainer;
 use Testcontainer\Container\MySQLContainer;
 use Testcontainer\Container\OpenSearchContainer;
+use Testcontainer\Container\PostgresContainer;
 use Testcontainer\Container\RedisContainer;
 
 class ContainerTest extends TestCase
@@ -95,4 +96,26 @@ class ContainerTest extends TestCase
 
         $this->assertEquals('docker-cluster', $data['cluster_name']);
     }
+
+    public function testPostgreSQLContainer(): void
+    {
+        $container = PostgresContainer::make('latest', 'test')
+            ->withPostgresUser('test')
+            ->withPostgresDatabase('foo');
+
+
+        $pdo = new \PDO(
+            sprintf('postgres:host=%s;port=3306', $container->getAddress()),
+            'test',
+            'test',
+        );
+
+        $query = $pdo->query('SHOW databases');
+
+        $this->assertInstanceOf(\PDOStatement::class, $query);
+
+        $databases = $query->fetchAll(\PDO::FETCH_COLUMN);
+
+        $this->assertContains('foo', $databases);
+    }
 }