fix logic and tests, update docker CI file

tests/Unit/Services/ClassPreparation/ClassPreparationCalculatorServiceTest.php

@@ -45,6 +45,7 @@ class ClassPreparationCalculatorServiceTest extends TestCase
             'class_section_id' => 101,
             'teacher_id' => 1,
             'position' => 'main',
+            'semester' => 'Fall',
             'school_year' => '2025-2026',
         ]);
 

tests/Unit/Services/ClassPreparation/ClassPreparationServiceTest.php

@@ -15,7 +15,7 @@ class ClassPreparationServiceTest extends TestCase
     {
         $this->seedPrepData();
 
-        $service = new ClassPreparationService();
+        $service = app(ClassPreparationService::class);
         $payload = $service->listPrep('2025-2026', 'Fall');
 
         $this->assertSame('2025-2026', $payload['schoolYear']);
@@ -28,7 +28,7 @@ class ClassPreparationServiceTest extends TestCase
     {
         $this->seedPrepData();
 
-        $service = new ClassPreparationService();
+        $service = app(ClassPreparationService::class);
         $count = $service->markPrinted('2025-2026', 'Fall', [101]);
 
         $this->assertSame(1, $count);