Increase preview card image size limit from 2MB to 8MB when using libvips (#31904)

app/models/preview_card.rb

@@ -39,7 +39,7 @@ class PreviewCard < ApplicationRecord
   include Attachmentable
 
   IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-  LIMIT = 2.megabytes
+  LIMIT = Rails.configuration.x.use_vips ? 8.megabytes : 2.megabytes
 
   BLURHASH_OPTIONS = {
     x_comp: 4,

spec/models/preview_card_spec.rb

@@ -3,6 +3,12 @@
 require 'rails_helper'
 
 RSpec.describe PreviewCard do
+  describe 'file size limit', :attachment_processing do
+    it 'is set differently whether vips is enabled or not' do
+      expect(described_class::LIMIT).to eq(Rails.configuration.x.use_vips ? 8.megabytes : 2.megabytes)
+    end
+  end
+
   describe 'validations' do
     describe 'urls' do
       it 'allows http schemes' do