Loading course run card image from marketing site (#279)

ECOM-5384

course_discovery/apps/course_metadata/data_loaders/marketing_site.py

@@ -396,6 +396,7 @@ class CourseMarketingSiteDataLoader(AbstractMarketingSiteDataLoader):
             'uuid': uuid,
             'language': language,
             'slug': slug,
+            'card_image_url': self._get_nested_url(data.get('field_course_image_promoted')),
         }
 
         try:

course_discovery/apps/course_metadata/data_loaders/tests/test_marketing_site.py

@@ -416,6 +416,7 @@ class CourseMarketingSiteDataLoaderTests(AbstractMarketingSiteDataLoaderTestMixi
             'key': data['field_course_id'],
             'language': language,
             'slug': data['url'].split('/')[-1],
+            'card_image_url': (data.get('field_course_image_promoted') or {}).get('url'),
         }
 
         for field, value in expected_values.items():