misc: give profile images a .jpeg extension (#27645)

This makes sure nginx will serve them with a correct MIME type.

src/authentic2/attribute_kinds.py

@@ -125,7 +125,7 @@ def profile_image_serialize(uploadedfile):
         h_computation.update(chunk)
     hexdigest = h_computation.hexdigest()
     stored_file = default_storage.save(
-        os.path.join('profile-image', hexdigest),
+        os.path.join('profile-image', hexdigest + '.jpeg'),
         uploadedfile)
     return stored_file
 

tests/test_attribute_kinds.py

@@ -411,6 +411,7 @@ def test_profile_image(db, app, admin, mailoutbox, media):
     response = form.submit()
     assert john().attributes.cityscape_image
     profile_filename = john().attributes.cityscape_image.name
+    assert profile_filename.endswith('.jpeg')
 
     # verify API serves absolute URL for profile images
     app.authorization = ('Basic', (admin.username, admin.username))