WIP Store avatars as ActiveStorage attachments

Also push to LDAP as jpegPhoto

spec/features/settings/profile_spec.rb

@@ -16,8 +16,6 @@ RSpec.describe 'Profile settings', type: :feature do
       .and_return({
         uid: user.cn, ou: user.ou, display_name: "Mark", pgp_key: nil
       })
-    allow_any_instance_of(User).to receive(:avatar)
-      .and_return(avatar_jpeg)
   end
 
   feature "Update display name" do
@@ -61,13 +59,16 @@ RSpec.describe 'Profile settings', type: :feature do
     end
 
     scenario "fails with validation error for file size too large" do
+      expect_any_instance_of(LdapManager::UpdateAvatar)
+        .not_to receive(:replace_attribute).and_return(true)
+
       visit setting_path(:profile)
       attach_file "Avatar", "#{Rails.root}/spec/fixtures/files/fsociety-irc.png"
       click_button "Save"
 
       expect(current_url).to eq(setting_url(:profile))
       within ".error-msg" do
-        expect(page).to have_content("file size is too large")
+        expect(page).to have_content("must be less than 1MB")
       end
     end