logs and save extension for preview

apps/establishment/management/commands/establishment_optimize_preview_image.py

@@ -1,3 +1,5 @@
+import os
+
 from django.conf import settings
 from django.core.management.base import BaseCommand
 from django.db import transaction
@@ -21,8 +23,13 @@ class Command(BaseCommand):
                 sorl_width_height = sorl_settings['geometry_string'].split('x')
 
                 if int(sorl_width_height[0]) > width or int(sorl_width_height[1]) > height:
+                    _, file_ext = os.path.splitext(establishment.preview_image_url)
+
+                    self.stdout.write(self.style.SUCCESS(f'Optimize: {establishment.preview_image_url}, extension: {file_ext}'))
+
                     establishment.preview_image_url = get_thumbnail(
                         file_=establishment.preview_image_url,
-                        **sorl_settings
+                        **sorl_settings,
+                        format='PNG' if file_ext[1:] == 'png' else 'JPEG'
                     ).url
                     establishment.save()